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Audio-Heaven | Take pleasure in music by way of headphones on a low funds

Audio-Heaven | Take pleasure in music by way of headphones on a low funds

2023-06-18 08:44:10

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When new data is added it is going to be proven beneath within the ‘whats new‘ part beneath.

post separation

List of measured headphones
What’s new ?

Under are postings in chronological order (newest ones on prime)

> added 06-16: GEWA HP eight measurements and analysis
up to date 06-11: selling some reviewed headphones.
> added 06-04: HIFIMAN Edition XS measurements, analysis and filter.
> added 05-26: FiiO FT3 measurements, analysis and straightforward repair.
> added 05-19: Sennheiser HD 477 measurements and analysis.
> added 05-18AKG K141 monitor (600Ω) measurements and analysis.
> added 04-24AKG K240 monitor (600Ω) measurements and analysis.
> added 04-22: Bowers & Wilkins PX measurements and analysis.
> added 04-07: Sennheiser HD 660S2 measurements and analysis.
> added 03-17: Yamaha HPH-MT7 measurements and analysis.
> added 02-18: Superlux HD668B measurements, analysis and modification.
> added 02-17: JBL LIVE 500 BT measurements and analysis.
> added 02-10: Austrian Audio Hi X60 measurements and analysis.
> added 02-03: OLLO S5X (1.0) measurements and analysis.
> added 01-16: Philips EM6721 measurements and analysis.


——————– 2023 ————————
——————– 2022 ————————

beneath: date format MM-DD

> added 12-19: fun generation HP5 measurements, analysis, modification and pads
up to date 11-25: Sennheiser HD560S article with aftermarket pad measurements
> added 11-23: Shure SRH-940 measurements, analysis, modification and pads
> added 11-06: Creative Aurvana Live! SE measurements, analysis and modifications
> added 10-24: audio-technica ATH-AD700X measurements, analysis and modification
up to date 10-17: Fastened some damaged hyperlinks, Foobar 2000 for Dummies (Part 1)
> added 10-15: Creative Aurvana Live! 2 measurements, analysis and modifications
up to date 09-19: Beyerdynamic DT250-250 article (L-R imbalance)
> added 09-18: Sennheiser HD 520 measurements, analysis and pads
> added 09-17: Sennheiser HD 400S measurements, analysis and modification
> added 09-15: Denon AH-MM200 measurements and analysis
up to date 09-05: Foobar 2000 for Dummies (Part 2)
> added 09-01: HIFIMAN Sundara (2021) measurements and analysis
> added 07-17: Status Audio: CB-1 measurements and analysis
up to date 07-09: OLLO Audio S4X (1.1) Reference article (filtering)
> added 07-07: Philips SHP9600 measurements and analysis
> added 05-21: Mackie MC-150 measurements, analysis and modifications
> added 05-15: OLLO Audio S4X (1.1) Reference measurements and analysis
> added 05-14: OLLO Audio S4R (1.1) measurements and analysis
> added 05-01: AKG K240 studio measurements and analysis
> added 04-30: HIFIMAN HE400i (2020) measurements and analysis
up to date 04-18: Beyerdynamic DT990/250 article
> added 04-16: Beyerdynamic DT 700 PRO X measurements, analysis and modification.
up to date 04-05: moved the headphone filter web page
> added 04-02: Røde NTH-100 measurements and analysis
> added 03-18: Brainwavz HM5 measurements and analysis
> added 02-26: AKG K514-mkII measurements and analysis
> added 02-06: Beyerdynamic DT 240 Pro measurements, analysis and modification
> added 02-03: Pioneer SE-M5ST measurements and analysis
> added 02-02: audio-technica ATH-A700X measurements and analysis
> added 01-24: Beyerdynamic T51i measurements and analysis
> added 01-23: Sennheiser HD430 measurements and analysis
up to date 01-09: HIFIMAN HE35X article, added modification.


——————– 2022 ————————
——————– 2021 ————————

beneath: date format MMDD

up to date 12-30: Selling some headphones (inside E.U. solely, sorry)
> added 12-24: Sony MDR-ZX110 measurements and analysis
> added 12-18: BRAINZ H10 measurements and analysis
> added 12-10: HIFIMAN HE400se measurements and analysis
> added 12-05: Koss KPH30i measurements, analysis and modification
> added 11-29: Sennheiser PXC550-II measurements and analysis
> added 11-24: Sony MDR-7509 HD measurements and analysis
> added 11-11: JBL TUNE 710 BT measurements and analysis
> added 11-01: Beyerdynamic DT 900 PRO X measurements and analysis
> added 10-04: Sennheiser HD590 Prestige measurements and analysis
> added 10-03: Beyerdynamic TYGR 300 R measurements and analysis
> added 10-02: Devine PRO 4000 measurements, analysis and modification
> added 09-16: audio-technica ATH-M50X measurements and analysis
> added 08-23: Sennheiser HD595 (SE) measurements and analysis
> added 08-22: DAP audio: HP-280 Pro measurements, analysis and modification
> added 07-25: Sennheiser HD560 Ovation II measurements, analysis and modification
> added 07-16: Sennheiser HD414 (unique 2kΩ model) measurements
up to date 07-09: Measured the brand new (2021) Sennheiser pads for HD6** collection in article about earpads
> added 05-22: Sennheiser HD570 Symphony measurements and analysis
up to date 05-02: HIFIMAN HE560(v2) measurements
> added 04-18: Shure SRH-440 measurements and analysis
> added 04-10: Superlux HD330 measurements, analysis and modification.
up to date 04-03: added Sennheiser HD800 replacement pad measurements.
up to date 03-25: AKG K702 measurements, added bass port mod measurements
> added 02-22: Behringer BH-470 measurements, analysis and modification
> added 02-06: Article about earpads
> added 01-23: Superlux HD660Pro (proto) measurements, analysis and modifications
> added 01-19: audio-technica ATH-SR9 measurements, analysis and modifications
up to date 01-06: Audeze Sine measurements, analysis and modifications


——————– 2021 ————————
——————– 2020 ————————

beneath: date format MMDD

up to date 12-13: Sennheiser HD800S article
> added 12-13: AKG: N60NC (wired) measurements and analysis
> added 11-16: Sennheiser HD559 measurements, analysis and modifications.
> added 11-02: Inner|Fidelity measurement collection PDF accomplished & alphabetical
up to date 10-08: headphone power table
> added 09-24: Sennheiser HD560S measurements and analysis
up to date 08-08: AKG K702 K712 & K7XX measurements .
> added 08-01: AKG K712 measurements and analysis.
> added 07-26: Beyerdynamic DT 880-600 measurements and analysis.
> added 06-27: Shure SRH-1440 measurements and analysis
> added 06-24: Shure SRH-840 measurements and analysis
up to date 06-14: DT880 Black SE and HD800 pages, added new data
> added 06-07: Beyerdynamic DT 880 Black SE measurements, modifications
> added 04-30: AKG K361 measurements and analysis.
> added 04-19: AKG K371 measurements and analysis.
> added 03-25: Roland RH-5 measurements and analysis.
> added 02-03: AKG K702 measurements, analysis and treble ‘repair’
up to date 02-02: measurements added of a ‘veiled’ HD650 (not a fable)
> added 01-22: Shure SRH-1840 measurements and analysis.
> added 01-19: Shure SRH-1540 measurements and analysis.


——————– 2020 ————————
——————– 2019 ————————

beneath: date format MMDD

> added 11-14: Philips Fidelio X2HR measurements and analysis.
> added 10-11: audio-technica ATH-MSR7 measurements and analysis.
> added 10-10: Yamaha HPH-MT220 measurements and analysis.
> added 09-15: extra passive filters
> added 08-30: AKG K812 measurements, analysis.
up to date 08-17: Beyerdynamic DT1770 measurements, analysis and modification
up to date 08-11: Beyerdynamic DT1990 measurements, analysis and modification
> added 07-13: classic Sennheiser HD420 SL restoration and analysis
> added 07-11: Sennheiser HD 4.40 BT measurements and analysis
> added 06-16: 1MORE Triple Driver Over-Ear measurements and analysis
up to date 06-16: NAD VISO HP50 added passive filter schematic
up to date 06-15: measurements of current Romanian produced HD58X
> added 05-19: Grundig EE1178 (BlueTooth) measurements and analysis
> added 05-19: Denon AH-GC20 (B.T. / N.C.) measurements and analysis
> added 05-15: Bose QC35-II (B.T. / N.C.) measurements and analysis
> added 04-03HIFIMAN HE35X measurements and analysis
> added 03-31: AKG K701 measurements and analysis
> added 03-10: Sony WH-1000X-M3 (B.T. / N.C.) measurements and analysis
> added 03-09Sony WH-CH700N (B.T. / N.C.) measurements and analysis
> added 01-24: HIFIMAN Edition XX measurements, analysis, modification
> added 01-12: AKG K7XX (Massdrop) measurements and analysis
up to date 01-02: Superlux HD681 measurements


——————– 2019 ————————
——————– 2018 ————————

beneath: date format MMDD

up to date 12-27: Massdrop HD58X modifications article
> added 12-08: Marshall Major II Bluetooth measurements and analysis
up to date 11-18: Some additional information on Koss KSC75 earphones
> added 10-21: A for sale section the place some reviewed gear is up on the market
> added 10-17: Beyerdynamic T51p measurements and analysis
up to date 10-07Beyerdynamic Custom One Pro with COPPlus measurements.
> added 09-29: NAD VISO HP50 measurements and analysis
> added 08-26Beyerdynamic Custom One Pro measurements, analysis and modifications
> added 08-25: Pioneer SE-305 measurements and analysis
> added 08-19: Campfire Audio Cascade measurements and analysis
> added 08-18: Audeze LCD-4z measurements and analysis
> added 08-17: Sennheiser HD820 measurements and analysis
> added 08-13: Powerbank output keep-alive circuit for powering low present gadgets
> added 07-02: MrSpeakers Ether measurements and analysis
> added 07-01: Superlux HD687 measurements, mods and analysis
up to date 07-01Sennheiser HD58X Jubilee added some plots
> added 06-27: AKG K92 measurements and analysis
> added 06-26Beyerdynamic Amiron Wireless measurements
> added 06-25: Sennheiser HD599 measurements
up to date 06-25Sennheiser HD58X Jubilee measurements and analysis
> added 06-24: Audeze LCD-2 Classic measurements
> added 06-24: Audeze LCD-MX4 measurements
> added 06-23: Sennheiser HD569 measurements
> added 06-23: HIFIMAN Sundara measurements
> added 06-23: Final D8000 measurements and analysis
> added 06-21: HIFIMAN Ananda measurements and analysis
> added 06-08: Mitchell & Johnson  JP1 DJ measurements
> added 05-26: Beyerdynamic DT 880 Edition treble modification
up to date 05-20: 3rd-party-plots helpful hyperlinks to different measurement websites
up to date 04-24: Beyerdynamic DT 880 Edition (250Ω) measurements
up to date 04-07: Kameleon filter list.
> added 04-01: Superlux HD671 measurements and analysis
up to date 03-17: Passive filter for Master & Dynamic MH40 added
> added 03-14: Master & Dynamic MH40 measurements
> added 03-12: Beyerdynamic DT 880 Edition (250Ω) measurements
> added 02-17: Superlux HD672 measurements and analysis
> added 02-10: Takstar PRO 82 monitor measurements and analysis
up to date 01-21: Superlux HD688 manufacturing model measurements


——————– 2018 ————————
——————– 2017 ————————

beneath: date format MMDD

up to date 12-26: pdf with extra Sennheiser HD58X measurements and experiments
> added 12-21: Sennheiser HD58X Jubilee (Massdrop) measurements and impressions
> added 11:25: MrSpeakers ÆON Open measurements and impressions
> added 11:23: Focal Clear measurements and impressions
> added 11:02: MrSpeakers ÆON Closed measurements
> added 11:02: MrSpeakers Ether flow (open) measurements
> added 11:02: MrSpeakers Ether C flow (closed) measurements
up to date 11:02: Sennheiser HD660S measurements with HD600 comparo.
> added 10-28: HIFIMAN Susvara measurements
> added 10-28: Grado GS2000e measurements
> added 10-28: Audeze LCD-4 measurements
> added 10:26: JBL E40 BT measurements
> added 10:25: Sennheiser HD800S measurements
> added 10:24: Sennheiser HD660S measurements.
up to date 10-08: Denon AH-D600 modifications measurements.
up to date 09-21: Sennheiser HD250 linear II measurements.
up to date 09-19AKG K501 measurements with some experiments.
> added 09-08AKG K501 measurements.
> added 09-06: HIFIMAN HE-6 (early 4-screw model) measurements.
> added 08-10: Creative Sound BlasterX H7 Tournament measurements.
> added 07-20: HIFIMAN HE1000 measurements
> added 07-19HIFIMAN Edition S and Edition X measurements
> added 07-18HIFIMAN HE400S and HE-560 measurements
up to date 07-17: HIFIMAN HE400i measurements
> added 07-16: Beyerdynamic T1 (mk2) and T5P (mk2) measurements
> added 07-16: Beyerdynamic DT 1770 Pro and DT 1990 Pro measurements
> added 07-15: Focal Utopia and Listen measurements
> added 07-14: Focal Elear measurements
> added 07-13: Sennheiser Momentum 2 (over-ear) measurements
> added 07-12: Sennheiser HD250 linear II measurements
> added 07-11: Sennheiser HD630VB measurements
> added 07-10: Sennheiser HD700 measurements
> added 07-10: Sennheiser HD 2.20 measurements
> added 07-09: V-MODA crossfade II wireless measurements
> added 07-08: V-MODA Crossfade M100 measurements
> added 07-08: Final Sonorous III measurements
> added 07-07: Denon AH-D600 measurements
> added 07-07: Audeze Sine measurements
> added 07-05: Audeze LCD-3, LCD-X and LCD-XC measurements
> added 07-05: Meze 99 classics and 99 neo measurements.
> added 07-04: Audeze EL-8 open, EL-8 Titanium and LCD-2
> added 07-03: Beyerdynamic Amiron measurements.
up to date 07-01: Foobar Tutorials
up to date 06-23: Cables article
> added 06-17: Balanced attenuators in attenuator and power-amp sections.
up to date 06-04: Foobar tutorial part 2
> added 06-03: Battery circuit change for Kameleon and Kameleon 2 transportable amps.
up to date 06-01: supported Kameleon modules checklist
up to date 04-17: extra Roland RH-300 measurements.
> added 04-08: Roland RH-300 measurements.
up to date 03-18: modified the how to interpret graphs tree-structure
up to date 03-12: added data to the how to interpret graphs article
> added 03-08: t.bone HD 990 D headphone in measurements
up to date 03-03: supported Kameleon modules checklist
> added 03-01: Superlux HD687 (prototype) measurements
up to date 02-18: Fostex TH-X00 and Fostex T50RP mk3 measurements
> added 02-11: Fostex TH-X00 (Mahogany) in measurements|Fostex
> added 02-07: Fostex T50RP mk3 in measurements|Fostex
> added 02-05: Superlux HD688 (prototype) measurements
> added 01-24: Compressing DSD files with Wavpack 5 tutorial
up to date 01-09: Kameleon-2 Desktop and Portable amp construct manuals
up to date 01-02: Headphone attenuator adapter article

——————– 2016 ————————
——————– 2015 ————————

beneath: date format MMDD

up to date 12-31: Foobar tutorials
up to date 12-08: ATH-MSR7 turned out to be pretend, moved to crap section
> added 11-26: Devoted Kameleon page
up to date 11-16: HiFiman HE-350 measurements
up to date 10-29: supported headphone checklist for Kameleon
up to date 10-20: HiFiman HE-350 measurements (2nd HE350 + seal)
> added 10-19: Veclan Monk+ in measurements
> added 10-19: FAKE audio-technica ATH-MSR7 measurements
up to date 10-12: Re-arranged the measurements section
> added 10-08: repair for HiFiman HE-350 treble  in measurements|HIFIMAN
> added 10-08: HiFiman HE-350 measurements in measurements|HIFIMAN
up to date 10-03: Kameleon articles (extra filter modules added) in schematics|headphone
> added 09-17: Sony MDR-100AAP measurements in measurements|Sony
> added 09-15: Pre-production Superlux HD581 in measurements|Superlux
> added 09-12: Sony MDR-1A measurements in measurements|Sony
> added 09-04: In-line Kameleon guide
up to date 09-04: Kameleon-2 desktop and portable amp manuals
> added 08-24: My views on ‘neutral sound‘ in learn
> added 08-06: Affect of Fletcher-Munson on listening pleasure in learn
> added 07-28: Taming the treble article in headphones|taming the treble
up to date 07-27: How to interpret graphs, added interior|constancy compensation.
> added 06-19: Philips SHB-9850NC measurements in measurements|Philips
up to date 06-01: headphone power table in learn|articles
> added 06-01: Beyerdynamic DT150 measurements in measurements|Beyerdynamic
up to date 05-26: Headphone adapter article in learn|Power-amp-adapter
up to date 05-21: Superlux HD662-EVO measurements in measurements|Superlux
up to date 05-14: data about SMPS vs LPS energy provides in learn|energy provide sorts
>added 05-04: Ausdom ANC7 measurements in measurements|Ausdom
>added 04-15: Schematic G1217 challenge Ember rev. 2.1 in schematics|amplifier
up to date 03-09 AudioQuest NightHawk cable in measurements|AudioQuest
>added 03-03: AudioQuest NightHawk measurements in measurements|AudioQuest
> added 02-23: Kameleon 2 DESKTOP build manual
up to date 02-21: Kameleon 2 PORTABLE build manual
> added 01-31: Superlux HD662-EVO measurements in measurements|Superlux
> added 01-28: HiFiMan HE-400i measurements in measurements|HIFIMAN
> added 01-24: Beats Studio Wi-fi measurements in measurements|Beats
up to date 01-24: Ausdom M05 measurements in measurements|Ausdom
> added 01-08: Sennheiser HD700 passive filter in schematics|headphone related

——————– 2016 ————————
——————– 2015 ————————

beneath: date format MM-DD

up to date 12-24: Some headphone measurements have been up to date.
> added 12-24: Bose Quiet Comfort 25 in measurements|Bose
> added 12-19: Bravo Ocean modifications in schematics|amplifiers
> added 12-16: Kameleon-2 article.
up to date 12-13: Philips cityscape uptown in measurements|Philips
up to date 12-02: Superlux HD681 and HD681-EVO in measurements|Superlux
> added 12-02: Superlux HD572-SP measurements in measurements|Superlux
> added 11-19: Passive filters for some Hifiman fashions in schematics|headphone
> added 11-18: Sennheiser HD800 measurements in measurements|Sennheiser
> added 11-13: Foobar tutorial part 3 SACD plugin in digital|software
up to date 11-12: But some extra measurements in Sennheiser HD650 modifications.
up to date 11-02: Foobar tutorial about taking part in DSD in digital|PC software.
> added 11-01: created a download section with articles/schematics and so on.
up to date 10-18: Even extra measurements on Sennheiser HD650 modifications.
up to date 10-15: Foobar 2000 for dummies in digital|PC software.
up to date 09-17: added data about square-waves in explanations|how to interpret graphs
up to date 09-17: Details about listening ranges in learn|power etc.
> added 09-13: In depth measurements on Sennheiser HD650 modifications.
> added 09-12: Passive inline filter for some HIFIMAN headphones
> added 08-23: Some ramblings about DR, distortion and SPL in learn|DR
up to date 08-13: Ostay-Welti goal curve in explanations|how to interpret graphs
up to date 08-11: Headphone correction filter article
> added 06-29: Information about headphone attenuators for IEM’s and delicate headphones.
up to date 06-17: details about energy provides in learn|power supplies
up to date 05-23: Headphone correction filter guide in schematics|headphone
> added 05-02: Schematics for the ‘SeNNator‘ amplifier in schematics|amplifier
up to date 05-07: Kameleon article in schematics|headphone
> added 05-02: Measurements of Sennheiser HD600 and Ultrasone HFI-780
> added 04-23: Schematics for the newest variations of a number of G1217 amps.
up to date 04-19: Philips uptown article (added data about securing the pads)
up to date 04-12: Added some data on tubes in amplifiers|hybrid
up to date 03-21: Kameleon and filter article in schematics|headphone
> added 03-08: An in depth article about the Superlux HD562 in pdf format.
> added 02-28: Beyerdynamic DT770Pro-250 and DT990Pro-250  in headphones|measurements
> added 02-27: Grado SR125i measurements in headphones|measurements
> added 02-27: AKG K612 measurements in headphones|measurements
> added 02-18: Superlux HD562 measurements in headphones|measurements
up to date 02-07: FiiO and Sansa measurements in Digital|Digital Audio Players
> added 02-06: Schematic of challenge Solstice in schematics|amplifier
up to date 02-04: Added plots from Kameleon amp in schematics|headphone
up to date 02-02: Philips SHL9505-GY plots in headphones|measurements
> added 01-28: Information about HD650 pads in headphones|measurements
up to date 01-26: Information on rectifiers in learn|power supply/filters
> added 01-21: ARTA setup information by BMF in learn|articles
> added 01-20: my views on ‘burn-in‘ in learn|burn-in
up to date 01-11: the headphones|recommended ones part.

——————– 2015 ————————
——————– 2014 ————————

beneath: date format MM-DD

up to date 12-28: The AKG K518-DJ in headphone|measurements
> added 12-24: Philips Cityscape Uptown SHL9505 in headphones|measurements
up to date 12-24: modified the format of headphones|measurements
> added 12-16: Schematic of a tube buffer circuit in Schematics|Amplifier
> added 11-16: Some data about measurements and disclaimer in headphones|measurements
> added 11-13: Article about dB: do deciBells ring a bell ? in learn|do decibells
up to date 10-04: Philips A5 Professional with PCU110 velours pads measurements in headphones|measurements
> added 10-01: Philips A5 Professional measurements in headphones|measurements
up to date 09-10: Kameleon article (added Sennheiser Momentum)
> added 09-04: Some further data about getting an excellent ‘seal’ of headphones in just a few pages.
> added 08-20: Project Polaris schematic in Schematics|Amplifier
> added 08-14: Measurements of Sansa Clip Sport, Fuze and FiiO X3 in digital|DAP
up to date 08-10: Some data added in schematics|amplifier part
up to date 08-09: headphone power table
> added 07-13: AKG K181 / K400 / K500 & Beyerdynamic DT250-250 in headphones|measurements
> added 07-09: Superlux HD-685 analysis and modifications in Schematics|Headphone
> added 07-05: DIY Woodies made by ‘Stratocaster’ in headphones|measurements
> added 06-25: Philips SHP-9500 and Superlux HD685 in headphones|measurements
> added 06-13: Philips Fidelio X1 in  headphones|measurements
up to date 06-11: Beyerdynamic DT1350-SL pad measurements in headphones|measurements
> added 05-29: Audio Technica ATH-M40X modifications in  headphones|measurements
> added 05-27: Audio Technica ATH-M40X in  headphones|measurements
up to date 05-22: Headphone correction filter article in Schematics|Headphone
up to date 05-19: headphones|recommended ones web page.
up to date 05-14: added headphone(s) to the Kameleon article in schematics|amplifier.
up to date 05-14: Kameleon article and headphone power table
> added 04-28: Kameleon transportable headphone amplifier article in schematics|amplifier
> added 04-19: Some details about regulators in Explanations|power supplies.
up to date 04-09: Tascam TH-02 mods in  headphones|measurements
> added 03-19: An part about effectivity in Explanations|power, impedance.
up to date 03-18: The Explanations|how to interpret graphs part with Olive-Welti curve.
> added 03-17: Beyerdynamic T90 passive highs/peak filter in schematics|headphone.
> added 03-16: How LOUD we pay attention, what energy we’d like for it ?  Explanations|power, impedance.
up to date 02-17: Beyerdynamic T50P/DT1350 pad measurements in headphones|measurements
> added 02-10: added Dawn-III and Horizon-III in schematics|amplifier
up to date 02-02: up to date model of the impedance/resistance article in learn|power, impedance .
> added 01-26: Tascam TH02 and AKG K550 measurements in headphones|measurements.
up to date 01-24: Foobar for dummies tutorial.
up to date 01-19: Koss KSC75 measurements with Kramer mod in headphones|measurements .
> added 01-18: Yello album opinions in music|album reviews part.
> added 01-15: Koss PortaPro measurements within the headphones|measurements part.
> added 01-12: Some data on the snubbering of diodes in rectifiers.
up to date 01-03: the headphones|recommended ones part.

——————– 2014 ————————
——————– 2013 ————————

beneath: date format MM-DD

up to date 12-22: Modified the format of the headphones|measurements part.
up to date 12-17: How a lot energy do you want ? solutions in:  learn|power, impedance.
> added 12-11: How a lot energy do you want ? solutions in:  learn|power, impedance.
> added 12-08: AKG K551 modification article within the schematics|headphone part.
> added 12-05: AKG K551 and Beyerdynamic T50P measurements in headphones|measurements
up to date 11-24: Superlux HD681-EVO article within the schematics|headphone part.
> added 11-14: Superlux HD681 substitute pad measurements in schematics|headphone
up to date 11-06: Added some headphones to the filter PCB article.
up to date 10-30: Some headphone cable measurements within the cable part.
> added 10-23: Teufel Aureol® Actual within the headphones|measurements part.
up to date 09-25: Superlux HD681-EVO newer model within the schematics|headphone part.
> added 09-18: SFI drivers DIY headphone within the headphones|measurements part.
> added 09-07: Superlux HD681-EVO modifications within the schematics|headphone part.
up to date 08-30: Power amp adapter circuit added.
up to date 08-25: Power supply article with additional information to restore SMPS
> added 08-21: Superlux HD681-EVO within the headphones|measurements part.
up to date 08-15: Power supply article with additional information on mains transformers
up to date 08-12: Power supply article with additional information on mains filters
> added 07-17: Plots of DT990-600 and KSC75  in headphones|measurements
> added 07-15: Some details about mains filters within the power supplies section
up to date 07-14: modified the location navigation barely.
up to date 07-12: Jays V-Jays within the headphones|measurements part.
> added 07-11Silverscrest KH-2347 plots within the headphones|measurements part.
> added 07-02: HD25-1 / HD 320 / HD215, Philips SHP-9000 in headphones|measurements
> added 06-27: Sony MDR-XB500 plots within the headphones|measurements part
up to date 06-30: Power supply article with further drawings and data
> added 06-25: Classic Stax SR-5 with SRD-6headphones|measurements
up to date 06-23: Headphones part and added some footage
> added 06-18: Details about amplifiers and the way they work
up to date 06-09: HD681 plots within the headphones|measurements part
> added 06-08: Easy rechargeable battery monitoring circuit schematic
> added 06-02: Overview of Handel’s Messiah
> added 05-31: Overview of Deep Purple’s album ‘Now What
> added 05-26: Anecdotal a couple of cable swap
> added 05-25: a hyperlink to an unimaginable quantity of audio related online calculators and explanations
> added 05-23:Some data on completely different headphone driver types.
> added 05-18: Technical data about Project Starlight & Ember
> added 05-15: the HD681 revisited a brand new article in regards to the filter and extra background data
up to date 05-12: the Headphone Correction Filter guide
> added 05-11: evaluate of the band TinyFish in Rock/Pop reviews
> added 05-07: Overview of Sennheiser RS160 – wi-fi headphones by Jeff.
> added 05-07: schematics of two new hybrid amplifiers.
> added 05-07: Some findings about DIY headphone measurement rigs.
up to date 05-02: the Headphone Correction Filter guide and T40RP-mkII / T50RP manuals.
> added 04-28: details about the NEW Headphone Correction Filter circuit.
> added 04-14: evaluate of the O2 headphone amplifier
up to date 04-13: The new filter PCB a sneak preview
up to date 04-10: Power supply article
> added 04-09: Measurements of some headphones.
> added 04-05: a part of the article on the utilization of speaker amplifiers for driving headphones.
> added 04-03: Web page with all headphone reviews on one web page.
> added 04-02: headphone reviews
up to date 03-31: Power supply article
> added 03-31: article about crossfeed.
> added 03-30: we added a FORUM along with the remark replies.
up to date 03-29: Rock & Pop album reviews
> added 03-28: Some details about rectifiers in energy provides
2013-03-08: Web site was created

——————– 2013 ————————

> added 04-30: HIFIMAN HE400i (2020) measurements, analysis
up to date 04-18: Beyerdynamic DT990/250 article
> added 04-16: Beyerdynamic DT 700 PRO X measurements, analysis and modification.
up to date 04-05: moved the headphone filter web page
> added 04-02: Røde NTH-100 measurements and analysis
> added 03-18: Brainwavz HM5 measurements and analysis
> added 02-26: AKG K514-mkII measurements and analysis
> added 02-06: Beyerdynamic DT 240 Pro measurements, analysis and modification
> added 02-03: Pioneer SE-M5ST measurements and analysis
> added 02-02: audio-technica ATH-A700X measurements and analysis
> added 01-24: Beyerdynamic T51i measurements and analysis
> added 01-23: Sennheiser HD430 measurements and analysis
up to date 01-09: HIFIMAN HE35X article, added modification.


——————– 2022 ————————
——————– 2021 ————————

beneath: date format MMDD

up to date 12-30: Selling some headphones (inside E.U. solely, sorry)
> added 12-24: Sony MDR-ZX110 measurements and analysis
> added 12-18: BRAINZ H10 measurements and analysis
> added 12-10: HIFIMAN HE400se measurements and analysis
> added 12-05: Koss KPH30i measurements, analysis and modification
> added 11-29: Sennheiser PXC550-II measurements and analysis
> added 11-24: Sony MDR-7509 HD measurements and analysis
> added 11-11: JBL TUNE 710 BT measurements and analysis
> added 11-01: Beyerdynamic DT 900 PRO X measurements and analysis
> added 10-04: Sennheiser HD590 Prestige measurements and analysis
> added 10-03: Beyerdynamic TYGR 300 R measurements and analysis
> added 10-02: Devine PRO 4000 measurements, analysis and modification
> added 09-16: audio-technica ATH-M50X measurements and analysis
> added 08-23: Sennheiser HD595 (SE) measurements and analysis
> added 08-22: DAP audio: HP-280 Pro measurements, analysis and modification
> added 07-25: Sennheiser HD560 Ovation II measurements, analysis and modification
> added 07-16: Sennheiser HD414 (unique 2kΩ model) measurements
up to date 07-09: Measured the brand new (2021) Sennheiser pads for HD6** collection in article about earpads
> added 05-22: Sennheiser HD570 Symphony measurements and analysis
up to date 05-02: HIFIMAN HE560(v2) measurements
> added 04-18: Shure SRH-440 measurements and analysis
> added 04-10: Superlux HD330 measurements, analysis and modification.
up to date 04-03: added Sennheiser HD800 replacement pad measurements.
up to date 03-25: AKG K702 measurements, added bass port mod measurements
> added 02-22: Behringer BH-470 measurements, analysis and modification
> added 02-06: Article about earpads
> added 01-23: Superlux HD660Pro (proto) measurements, analysis and modifications
> added 01-19: audio-technica ATH-SR9 measurements, analysis and modifications
up to date 01-06: Audeze Sine measurements, analysis and modifications


——————– 2021 ————————
——————– 2020 ————————

beneath: date format MMDD

up to date 12-13: Sennheiser HD800S article
> added 12-13: AKG: N60NC (wired) measurements and analysis
> added 11-16: Sennheiser HD559 measurements, analysis and modifications.
> added 11-02: Inner|Fidelity measurement collection PDF accomplished & alphabetical
up to date 10-08: headphone power table
> added 09-24: Sennheiser HD560S measurements and analysis
up to date 08-08: AKG K702 K712 & K7XX measurements .
> added 08-01: AKG K712 measurements and analysis.
> added 07-26: Beyerdynamic DT 880-600 measurements and analysis.
> added 06-27: Shure SRH-1440 measurements and analysis
> added 06-24: Shure SRH-840 measurements and analysis
up to date 06-14: DT880 Black SE and HD800 pages, added new data
> added 06-07: Beyerdynamic DT 880 Black SE measurements, modifications
> added 04-30: AKG K361 measurements and analysis.
> added 04-19: AKG K371 measurements and analysis.
> added 03-25: Roland RH-5 measurements and analysis.
> added 02-03: AKG K702 measurements, analysis and treble ‘repair’
up to date 02-02: measurements added of a ‘veiled’ HD650 (not a fable)
> added 01-22: Shure SRH-1840 measurements and analysis.
> added 01-19: Shure SRH-1540 measurements and analysis.


——————– 2020 ————————
——————– 2019 ————————

beneath: date format MMDD

> added 11-14: Philips Fidelio X2HR measurements and analysis.
> added 10-11: audio-technica ATH-MSR7 measurements and analysis.
> added 10-10: Yamaha HPH-MT220 measurements and analysis.
> added 09-15: extra passive filters
> added 08-30: AKG K812 measurements, analysis.
up to date 08-17: Beyerdynamic DT1770 measurements, analysis and modification
up to date 08-11: Beyerdynamic DT1990 measurements, analysis and modification
> added 07-13: classic Sennheiser HD420 SL restoration and analysis
> added 07-11: Sennheiser HD 4.40 BT measurements and analysis
> added 06-16: 1MORE Triple Driver Over-Ear measurements and analysis
up to date 06-16: NAD VISO HP50 added passive filter schematic
up to date 06-15: measurements of current Romanian produced HD58X
> added 05-19: Grundig EE1178 (BlueTooth) measurements and analysis
> added 05-19: Denon AH-GC20 (B.T. / N.C.) measurements and analysis
> added 05-15: Bose QC35-II (B.T. / N.C.) measurements and analysis
> added 04-03HIFIMAN HE35X measurements and analysis
> added 03-31: AKG K701 measurements and analysis
> added 03-10: Sony WH-1000X-M3 (B.T. / N.C.) measurements and analysis
> added 03-09Sony WH-CH700N (B.T. / N.C.) measurements and analysis
> added 01-24: HIFIMAN Edition XX measurements, analysis, modification
> added 01-12: AKG K7XX (Massdrop) measurements and analysis
up to date 01-02: Superlux HD681 measurements


——————– 2019 ————————
——————– 2018 ————————

beneath: date format MMDD

up to date 12-27: Massdrop HD58X modifications article
> added 12-08: Marshall Major II Bluetooth measurements and analysis
up to date 11-18: Some additional information on Koss KSC75 earphones
> added 10-21: A for sale section the place some reviewed gear is up on the market
> added 10-17: Beyerdynamic T51p measurements and analysis
up to date 10-07Beyerdynamic Custom One Pro with COPPlus measurements.
> added 09-29: NAD VISO HP50 measurements and analysis
> added 08-26Beyerdynamic Custom One Pro measurements, analysis and modifications
> added 08-25: Pioneer SE-305 measurements and analysis
> added 08-19: Campfire Audio Cascade measurements and analysis
> added 08-18: Audeze LCD-4z measurements and analysis
> added 08-17: Sennheiser HD820 measurements and analysis
> added 08-13: Powerbank output keep-alive circuit for powering low present gadgets
> added 07-02: MrSpeakers Ether measurements and analysis
> added 07-01: Superlux HD687 measurements, mods and analysis
up to date 07-01Sennheiser HD58X Jubilee added some plots
> added 06-27: AKG K92 measurements and analysis
> added 06-26Beyerdynamic Amiron Wireless measurements
> added 06-25: Sennheiser HD599 measurements
up to date 06-25Sennheiser HD58X Jubilee measurements and analysis
> added 06-24: Audeze LCD-2 Classic measurements
> added 06-24: Audeze LCD-MX4 measurements
> added 06-23: Sennheiser HD569 measurements
> added 06-23: HIFIMAN Sundara measurements
> added 06-23: Final D8000 measurements and analysis
> added 06-21: HIFIMAN Ananda measurements and analysis
> added 06-08: Mitchell & Johnson  JP1 DJ measurements
> added 05-26: Beyerdynamic DT 880 Edition treble modification
up to date 05-20: 3rd-party-plots helpful hyperlinks to different measurement websites
up to date 04-24: Beyerdynamic DT 880 Edition (250Ω) measurements
up to date 04-07: Kameleon filter list.
> added 04-01: Superlux HD671 measurements and analysis
up to date 03-17: Passive filter for Master & Dynamic MH40 added
> added 03-14: Master & Dynamic MH40 measurements
> added 03-12: Beyerdynamic DT 880 Edition (250Ω) measurements
> added 02-17: Superlux HD672 measurements and analysis
> added 02-10: Takstar PRO 82 monitor measurements and analysis
up to date 01-21: Superlux HD688 manufacturing model measurements


——————– 2018 ————————
——————– 2017 ————————

beneath: date format MMDD

up to date 12-26: pdf with extra Sennheiser HD58X measurements and experiments
> added 12-21: Sennheiser HD58X Jubilee (Massdrop) measurements and impressions
> added 11:25: MrSpeakers ÆON Open measurements and impressions
> added 11:23: Focal Clear measurements and impressions
> added 11:02: MrSpeakers ÆON Closed measurements
> added 11:02: MrSpeakers Ether flow (open) measurements
> added 11:02: MrSpeakers Ether C flow (closed) measurements
up to date 11:02: Sennheiser HD660S measurements with HD600 comparo.
> added 10-28: HIFIMAN Susvara measurements
> added 10-28: Grado GS2000e measurements
> added 10-28: Audeze LCD-4 measurements
> added 10:26: JBL E40 BT measurements
> added 10:25: Sennheiser HD800S measurements
> added 10:24: Sennheiser HD660S measurements.
up to date 10-08: Denon AH-D600 modifications measurements.
up to date 09-21: Sennheiser HD250 linear II measurements.
up to date 09-19AKG K501 measurements with some experiments.
> added 09-08AKG K501 measurements.
> added 09-06: HIFIMAN HE-6 (early 4-screw model) measurements.
> added 08-10: Creative Sound BlasterX H7 Tournament measurements.
> added 07-20: HIFIMAN HE1000 measurements
> added 07-19HIFIMAN Edition S and Edition X measurements
> added 07-18HIFIMAN HE400S and HE-560 measurements
up to date 07-17: HIFIMAN HE400i measurements
> added 07-16: Beyerdynamic T1 (mk2) and T5P (mk2) measurements
> added 07-16: Beyerdynamic DT 1770 Pro and DT 1990 Pro measurements
> added 07-15: Focal Utopia and Listen measurements
> added 07-14: Focal Elear measurements
> added 07-13: Sennheiser Momentum 2 (over-ear) measurements
> added 07-12: Sennheiser HD250 linear II measurements
> added 07-11: Sennheiser HD630VB measurements
> added 07-10: Sennheiser HD700 measurements
> added 07-10: Sennheiser HD 2.20 measurements
> added 07-09: V-MODA crossfade II wireless measurements
> added 07-08: V-MODA Crossfade M100 measurements
> added 07-08: Final Sonorous III measurements
> added 07-07: Denon AH-D600 measurements
> added 07-07: Audeze Sine measurements
> added 07-05: Audeze LCD-3, LCD-X and LCD-XC measurements
> added 07-05: Meze 99 classics and 99 neo measurements.
> added 07-04: Audeze EL-8 open, EL-8 Titanium and LCD-2
> added 07-03: Beyerdynamic Amiron measurements.
up to date 07-01: Foobar Tutorials
up to date 06-23: Cables article
> added 06-17: Balanced attenuators in attenuator and power-amp sections.
up to date 06-04: Foobar tutorial part 2
> added 06-03: Battery circuit change for Kameleon and Kameleon 2 transportable amps.
up to date 06-01: supported Kameleon modules checklist
up to date 04-17: extra Roland RH-300 measurements.
> added 04-08: Roland RH-300 measurements.
up to date 03-18: modified the how to interpret graphs tree-structure
up to date 03-12: added data to the how to interpret graphs article
> added 03-08: t.bone HD 990 D headphone in measurements
up to date 03-03: supported Kameleon modules checklist
> added 03-01: Superlux HD687 (prototype) measurements
up to date 02-18: Fostex TH-X00 and Fostex T50RP mk3 measurements
> added 02-11: Fostex TH-X00 (Mahogany) in measurements|Fostex
> added 02-07: Fostex T50RP mk3 in measurements|Fostex
> added 02-05: Superlux HD688 (prototype) measurements
> added 01-24: Compressing DSD files with Wavpack 5 tutorial
up to date 01-09: Kameleon-2 Desktop and Portable amp construct manuals
up to date 01-02: Headphone attenuator adapter article

——————– 2016 ————————
——————– 2015 ————————

beneath: date format MMDD

up to date 12-31: Foobar tutorials
up to date 12-08: ATH-MSR7 turned out to be pretend, moved to crap section
> added 11-26: Devoted Kameleon page
up to date 11-16: HiFiman HE-350 measurements
up to date 10-29: supported headphone checklist for Kameleon
up to date 10-20: HiFiman HE-350 measurements (2nd HE350 + seal)
> added 10-19: Veclan Monk+ in measurements
> added 10-19: FAKE audio-technica ATH-MSR7 measurements
up to date 10-12: Re-arranged the measurements section
> added 10-08: repair for HiFiman HE-350 treble  in measurements|HIFIMAN
> added 10-08: HiFiman HE-350 measurements in measurements|HIFIMAN
up to date 10-03: Kameleon articles (extra filter modules added) in schematics|headphone
> added 09-17: Sony MDR-100AAP measurements in measurements|Sony
> added 09-15: Pre-production Superlux HD581 in measurements|Superlux
> added 09-12: Sony MDR-1A measurements in measurements|Sony
> added 09-04: In-line Kameleon guide
up to date 09-04: Kameleon-2 desktop and portable amp manuals
> added 08-24: My views on ‘neutral sound‘ in learn
> added 08-06: Affect of Fletcher-Munson on listening pleasure in learn
> added 07-28: Taming the treble article in headphones|taming the treble
up to date 07-27: How to interpret graphs, added interior|constancy compensation.
> added 06-19: Philips SHB-9850NC measurements in measurements|Philips
up to date 06-01: headphone power table in learn|articles
> added 06-01: Beyerdynamic DT150 measurements in measurements|Beyerdynamic
up to date 05-26: Headphone adapter article in learn|Power-amp-adapter
up to date 05-21: Superlux HD662-EVO measurements in measurements|Superlux
up to date 05-14: data about SMPS vs LPS energy provides in learn|energy provide sorts
>added 05-04: Ausdom ANC7 measurements in measurements|Ausdom
>added 04-15: Schematic G1217 challenge Ember rev. 2.1 in schematics|amplifier
up to date 03-09 AudioQuest NightHawk cable in measurements|AudioQuest
>added 03-03: AudioQuest NightHawk measurements in measurements|AudioQuest
> added 02-23: Kameleon 2 DESKTOP build manual
up to date 02-21: Kameleon 2 PORTABLE build manual
> added 01-31: Superlux HD662-EVO measurements in measurements|Superlux
> added 01-28: HiFiMan HE-400i measurements in measurements|HIFIMAN
> added 01-24: Beats Studio Wi-fi measurements in measurements|Beats
up to date 01-24: Ausdom M05 measurements in measurements|Ausdom
> added 01-08: Sennheiser HD700 passive filter in schematics|headphone related

——————– 2016 ————————
——————– 2015 ————————

beneath: date format MM-DD

up to date 12-24: Some headphone measurements have been up to date.
> added 12-24: Bose Quiet Comfort 25 in measurements|Bose
> added 12-19: Bravo Ocean modifications in schematics|amplifiers
> added 12-16: Kameleon-2 article.
up to date 12-13: Philips cityscape uptown in measurements|Philips
up to date 12-02: Superlux HD681 and HD681-EVO in measurements|Superlux
> added 12-02: Superlux HD572-SP measurements in measurements|Superlux
> added 11-19: Passive filters for some Hifiman fashions in schematics|headphone
> added 11-18: Sennheiser HD800 measurements in measurements|Sennheiser
> added 11-13: Foobar tutorial part 3 SACD plugin in digital|software
up to date 11-12: But some extra measurements in Sennheiser HD650 modifications.
up to date 11-02: Foobar tutorial about taking part in DSD in digital|PC software.
> added 11-01: created a download section with articles/schematics and so on.
up to date 10-18: Even extra measurements on Sennheiser HD650 modifications.
up to date 10-15: Foobar 2000 for dummies in digital|PC software.
up to date 09-17: added data about square-waves in explanations|how to interpret graphs
up to date 09-17: Details about listening ranges in learn|power etc.
> added 09-13: In depth measurements on Sennheiser HD650 modifications.
> added 09-12: Passive inline filter for some HIFIMAN headphones
> added 08-23: Some ramblings about DR, distortion and SPL in learn|DR
up to date 08-13: Ostay-Welti goal curve in explanations|how to interpret graphs
up to date 08-11: Headphone correction filter article
> added 06-29: Information about headphone attenuators for IEM’s and delicate headphones.
up to date 06-17: details about energy provides in learn|power supplies
up to date 05-23: Headphone correction filter guide in schematics|headphone
> added 05-02: Schematics for the ‘SeNNator‘ amplifier in schematics|amplifier
up to date 05-07: Kameleon article in schematics|headphone
> added 05-02: Measurements of Sennheiser HD600 and Ultrasone HFI-780
> added 04-23: Schematics for the newest variations of a number of G1217 amps.
up to date 04-19: Philips uptown article (added data about securing the pads)
up to date 04-12: Added some data on tubes in amplifiers|hybrid
up to date 03-21: Kameleon and filter article in schematics|headphone
> added 03-08: An in depth article about the Superlux HD562 in pdf format.
> added 02-28: Beyerdynamic DT770Pro-250 and DT990Pro-250  in headphones|measurements
> added 02-27: Grado SR125i measurements in headphones|measurements
> added 02-27: AKG K612 measurements in headphones|measurements
> added 02-18: Superlux HD562 measurements in headphones|measurements
up to date 02-07: FiiO and Sansa measurements in Digital|Digital Audio Players
> added 02-06: Schematic of challenge Solstice in schematics|amplifier
up to date 02-04: Added plots from Kameleon amp in schematics|headphone
up to date 02-02: Philips SHL9505-GY plots in headphones|measurements
> added 01-28: Information about HD650 pads in headphones|measurements
up to date 01-26: Information on rectifiers in learn|power supply/filters
> added 01-21: ARTA setup information by BMF in learn|articles
> added 01-20: my views on ‘burn-in‘ in learn|burn-in
up to date 01-11: the headphones|recommended ones part.

——————– 2015 ————————
——————– 2014 ————————

beneath: date format MM-DD

up to date 12-28: The AKG K518-DJ in headphone|measurements
> added 12-24: Philips Cityscape Uptown SHL9505 in headphones|measurements
up to date 12-24: modified the format of headphones|measurements
> added 12-16: Schematic of a tube buffer circuit in Schematics|Amplifier
> added 11-16: Some data about measurements and disclaimer in headphones|measurements
> added 11-13: Article about dB: do deciBells ring a bell ? in learn|do decibells
up to date 10-04: Philips A5 Professional with PCU110 velours pads measurements in headphones|measurements
> added 10-01: Philips A5 Professional measurements in headphones|measurements
up to date 09-10: Kameleon article (added Sennheiser Momentum)
> added 09-04: Some further data about getting an excellent ‘seal’ of headphones in just a few pages.
> added 08-20: Project Polaris schematic in Schematics|Amplifier
> added 08-14: Measurements of Sansa Clip Sport, Fuze and FiiO X3 in digital|DAP
up to date 08-10: Some data added in schematics|amplifier part
up to date 08-09: headphone power table
> added 07-13: AKG K181 / K400 / K500 & Beyerdynamic DT250-250 in headphones|measurements
> added 07-09: Superlux HD-685 analysis and modifications in Schematics|Headphone
> added 07-05: DIY Woodies made by ‘Stratocaster’ in headphones|measurements
> added 06-25: Philips SHP-9500 and Superlux HD685 in headphones|measurements
> added 06-13: Philips Fidelio X1 in  headphones|measurements
up to date 06-11: Beyerdynamic DT1350-SL pad measurements in headphones|measurements
> added 05-29: Audio Technica ATH-M40X modifications in  headphones|measurements
> added 05-27: Audio Technica ATH-M40X in  headphones|measurements
up to date 05-22: Headphone correction filter article in Schematics|Headphone
up to date 05-19: headphones|recommended ones web page.
up to date 05-14: added headphone(s) to the Kameleon article in schematics|amplifier.
up to date 05-14: Kameleon article and headphone power table
> added 04-28: Kameleon transportable headphone amplifier article in schematics|amplifier
> added 04-19: Some details about regulators in Explanations|power supplies.
up to date 04-09: Tascam TH-02 mods in  headphones|measurements
> added 03-19: An part about effectivity in Explanations|power, impedance.
up to date 03-18: The Explanations|how to interpret graphs part with Olive-Welti curve.
> added 03-17: Beyerdynamic T90 passive highs/peak filter in schematics|headphone.
> added 03-16: How LOUD we pay attention, what energy we’d like for it ?  Explanations|power, impedance.
up to date 02-17: Beyerdynamic T50P/DT1350 pad measurements in headphones|measurements
> added 02-10: added Dawn-III and Horizon-III in schematics|amplifier
up to date 02-02: up to date model of the impedance/resistance article in learn|power, impedance .
> added 01-26: Tascam TH02 and AKG K550 measurements in headphones|measurements.
up to date 01-24: Foobar for dummies tutorial.
up to date 01-19: Koss KSC75 measurements with Kramer mod in headphones|measurements .
> added 01-18: Yello album opinions in music|album reviews part.
> added 01-15: Koss PortaPro measurements within the headphones|measurements part.
> added 01-12: Some data on the snubbering of diodes in rectifiers.
up to date 01-03: the headphones|recommended ones part.

——————– 2014 ————————
——————– 2013 ————————

beneath: date format MM-DD

up to date 12-22: Modified the format of the headphones|measurements part.
up to date 12-17: How a lot energy do you want ? solutions in:  learn|power, impedance.
> added 12-11: How a lot energy do you want ? solutions in:  learn|power, impedance.
> added 12-08: AKG K551 modification article within the schematics|headphone part.
> added 12-05: AKG K551 and Beyerdynamic T50P measurements in headphones|measurements
up to date 11-24: Superlux HD681-EVO article within the schematics|headphone part.
> added 11-14: Superlux HD681 substitute pad measurements in schematics|headphone
up to date 11-06: Added some headphones to the filter PCB article.
up to date 10-30: Some headphone cable measurements within the cable part.
> added 10-23: Teufel Aureol® Actual within the headphones|measurements part.
up to date 09-25: Superlux HD681-EVO newer model within the schematics|headphone part.
> added 09-18: SFI drivers DIY headphone within the headphones|measurements part.
> added 09-07: Superlux HD681-EVO modifications within the schematics|headphone part.
up to date 08-30: Power amp adapter circuit added.
up to date 08-25: Power supply article with additional information to restore SMPS
> added 08-21: Superlux HD681-EVO within the headphones|measurements part.
up to date 08-15: Power supply article with additional information on mains transformers
up to date 08-12: Power supply article with additional information on mains filters
> added 07-17: Plots of DT990-600 and KSC75  in headphones|measurements
> added 07-15: Some details about mains filters within the power supplies section
up to date 07-14: modified the location navigation barely.
up to date 07-12: Jays V-Jays within the headphones|measurements part.
> added 07-11Silverscrest KH-2347 plots within the headphones|measurements part.
> added 07-02: HD25-1 / HD 320 / HD215, Philips SHP-9000 in headphones|measurements
> added 06-27: Sony MDR-XB500 plots within the headphones|measurements part
up to date 06-30: Power supply article with further drawings and data
> added 06-25: Classic Stax SR-5 with SRD-6headphones|measurements
up to date 06-23: Headphones part and added some footage
> added 06-18: Details about amplifiers and the way they work
up to date 06-09: HD681 plots within the headphones|measurements part
> added 06-08: Easy rechargeable battery monitoring circuit schematic
> added 06-02: Overview of Handel’s Messiah
> added 05-31: Overview of Deep Purple’s album ‘Now What
> added 05-26: Anecdotal a couple of cable swap
> added 05-25: a hyperlink to an unimaginable quantity of audio related online calculators and explanations
> added 05-23:Some data on completely different headphone driver types.
> added 05-18: Technical data about Project Starlight & Ember
> added 05-15: the HD681 revisited a brand new article in regards to the filter and extra background data
up to date 05-12: the Headphone Correction Filter guide
> added 05-11: evaluate of the band TinyFish in Rock/Pop reviews
> added 05-07: Overview of Sennheiser RS160 – wi-fi headphones by Jeff.
> added 05-07: schematics of two new hybrid amplifiers.
> added 05-07: Some findings about DIY headphone measurement rigs.
up to date 05-02: the Headphone Correction Filter guide and T40RP-mkII / T50RP manuals.
> added 04-28: details about the NEW Headphone Correction Filter circuit.
> added 04-14: evaluate of the O2 headphone amplifier
up to date 04-13: The new filter PCB a sneak preview
up to date 04-10: Power supply article
> added 04-09: Measurements of some headphones.
> added 04-05: a part of the article on the utilization of speaker amplifiers for driving headphones.
> added 04-03: Web page with all headphone reviews on one web page.
> added 04-02: headphone reviews
up to date 03-31: Power supply article
> added 03-31: article about crossfeed.
> added 03-30: we added a FORUM along with the remark replies.
up to date 03-29: Rock & Pop album reviews
> added 03-28: Some details about rectifiers in energy provides
2013-03-08: Web site was created

——————– 2013 ————————

> added 10-24: audio-technica ATH-AD700X measurements, analysis and modification
up to date 10-17: Fastened some damaged hyperlinks
> added 10-15: Creative Auvana Live! 2 measurements, analysis and modifications
up to date 09-19: Beyerdynamic DT250-250 article (L-R imbalance)
> added 09-18: Sennheiser HD 520 measurements, analysis and pads
> added 09-17: Sennheiser HD 400S measurements, analysis and modification
> added 09-15: Denon AH-MM200 measurements and analysis
> added 09-01: HIFIMAN Sundara (2021) measurements and analysis
> added 07-17: Status Audio: CB-1 measurements and analysis
up to date 07-09: OLLO Audio S4X (1.1) Reference article (filtering)
> added 07-07: Philips SHP9600 measurements and analysis
> added 05-21: Mackie MC-150 measurements, analysis and modifications
> added 05-15: OLLO Audio S4X (1.1) Reference measurements and analysis
> added 05-14: OLLO Audio S4R (1.1) measurements and analysis
> added 05-01: AKG K240 studio measurements and analysis
> added 04-30: HIFIMAN HE400i (2020) measurements and analysis
up to date 04-18: Beyerdynamic DT990/250 article
> added 04-16: Beyerdynamic DT 700 PRO X measurements, analysis and modification.
up to date 04-05: moved the headphone filter web page
> added 04-02: Røde NTH-100 measurements and analysis
> added 03-18: Brainwavz HM5 measurements and analysis
> added 02-26: AKG K514-mkII measurements and analysis
> added 02-06: Beyerdynamic DT 240 Pro measurements, analysis and modification
> added 02-03: Pioneer SE-M5ST measurements and analysis
> added 02-02: audio-technica ATH-A700X measurements and analysis
> added 01-24: Beyerdynamic T51i measurements and analysis
> added 01-23: Sennheiser HD430 measurements and analysis
up to date 01-09: HIFIMAN HE35X article, added modification.


——————– 2022 ————————
——————– 2021 ————————

beneath: date format MMDD

up to date 12-30: Selling some headphones (inside E.U. solely, sorry)
> added 12-24: Sony MDR-ZX110 measurements and analysis
> added 12-18: BRAINZ H10 measurements and analysis
> added 12-10: HIFIMAN HE400se measurements and analysis
> added 12-05: Koss KPH30i measurements, analysis and modification
> added 11-29: Sennheiser PXC550-II measurements and analysis
> added 11-24: Sony MDR-7509 HD measurements and analysis
> added 11-11: JBL TUNE 710 BT measurements and analysis
> added 11-01: Beyerdynamic DT 900 PRO X measurements and analysis
> added 10-04: Sennheiser HD590 Prestige measurements and analysis
> added 10-03: Beyerdynamic TYGR 300 R measurements and analysis
> added 10-02: Devine PRO 4000 measurements, analysis and modification
> added 09-16: audio-technica ATH-M50X measurements and analysis
> added 08-23: Sennheiser HD595 (SE) measurements and analysis
> added 08-22: DAP audio: HP-280 Pro measurements, analysis and modification
> added 07-25: Sennheiser HD560 Ovation II measurements, analysis and modification
> added 07-16: Sennheiser HD414 (unique 2kΩ model) measurements
up to date 07-09: Measured the brand new (2021) Sennheiser pads for HD6** collection in article about earpads
> added 05-22: Sennheiser HD570 Symphony measurements and analysis
up to date 05-02: HIFIMAN HE560(v2) measurements
> added 04-18: Shure SRH-440 measurements and analysis
> added 04-10: Superlux HD330 measurements, analysis and modification.
up to date 04-03: added Sennheiser HD800 replacement pad measurements.
up to date 03-25: AKG K702 measurements, added bass port mod measurements
> added 02-22: Behringer BH-470 measurements, analysis and modification
> added 02-06: Article about earpads
> added 01-23: Superlux HD660Pro (proto) measurements, analysis and modifications
> added 01-19: audio-technica ATH-SR9 measurements, analysis and modifications
up to date 01-06: Audeze Sine measurements, analysis and modifications


——————– 2021 ————————
——————– 2020 ————————

beneath: date format MMDD

up to date 12-13: Sennheiser HD800S article
> added 12-13: AKG: N60NC (wired) measurements and analysis
> added 11-16: Sennheiser HD559 measurements, analysis and modifications.
> added 11-02: Inner|Fidelity measurement collection PDF accomplished & alphabetical
up to date 10-08: headphone power table
> added 09-24: Sennheiser HD560S measurements and analysis
up to date 08-08: AKG K702 K712 & K7XX measurements .
> added 08-01: AKG K712 measurements and analysis.
> added 07-26: Beyerdynamic DT 880-600 measurements and analysis.
> added 06-27: Shure SRH-1440 measurements and analysis
> added 06-24: Shure SRH-840 measurements and analysis
up to date 06-14: DT880 Black SE and HD800 pages, added new data
> added 06-07: Beyerdynamic DT 880 Black SE measurements, modifications
> added 04-30: AKG K361 measurements and analysis.
> added 04-19: AKG K371 measurements and analysis.
> added 03-25: Roland RH-5 measurements and analysis.
> added 02-03: AKG K702 measurements, analysis and treble ‘repair’
up to date 02-02: measurements added of a ‘veiled’ HD650 (not a fable)
> added 01-22: Shure SRH-1840 measurements and analysis.
> added 01-19: Shure SRH-1540 measurements and analysis.


——————– 2020 ————————
——————– 2019 ————————

beneath: date format MMDD

> added 11-14: Philips Fidelio X2HR measurements and analysis.
> added 10-11: audio-technica ATH-MSR7 measurements and analysis.
> added 10-10: Yamaha HPH-MT220 measurements and analysis.
> added 09-15: extra passive filters
> added 08-30: AKG K812 measurements, analysis.
up to date 08-17: Beyerdynamic DT1770 measurements, analysis and modification
up to date 08-11: Beyerdynamic DT1990 measurements, analysis and modification
> added 07-13: classic Sennheiser HD420 SL restoration and analysis
> added 07-11: Sennheiser HD 4.40 BT measurements and analysis
> added 06-16: 1MORE Triple Driver Over-Ear measurements and analysis
up to date 06-16: NAD VISO HP50 added passive filter schematic
up to date 06-15: measurements of current Romanian produced HD58X
> added 05-19: Grundig EE1178 (BlueTooth) measurements and analysis
> added 05-19: Denon AH-GC20 (B.T. / N.C.) measurements and analysis
> added 05-15: Bose QC35-II (B.T. / N.C.) measurements and analysis
> added 04-03HIFIMAN HE35X measurements and analysis
> added 03-31: AKG K701 measurements and analysis
> added 03-10: Sony WH-1000X-M3 (B.T. / N.C.) measurements and analysis
> added 03-09Sony WH-CH700N (B.T. / N.C.) measurements and analysis
> added 01-24: HIFIMAN Edition XX measurements, analysis, modification
> added 01-12: AKG K7XX (Massdrop) measurements and analysis
up to date 01-02: Superlux HD681 measurements

See Also


——————– 2019 ————————
——————– 2018 ————————

beneath: date format MMDD

up to date 12-27: Massdrop HD58X modifications article
> added 12-08: Marshall Major II Bluetooth measurements and analysis
up to date 11-18: Some additional information on Koss KSC75 earphones
> added 10-21: A for sale section the place some reviewed gear is up on the market
> added 10-17: Beyerdynamic T51p measurements and analysis
up to date 10-07Beyerdynamic Custom One Pro with COPPlus measurements.
> added 09-29: NAD VISO HP50 measurements and analysis
> added 08-26Beyerdynamic Custom One Pro measurements, analysis and modifications
> added 08-25: Pioneer SE-305 measurements and analysis
> added 08-19: Campfire Audio Cascade measurements and analysis
> added 08-18: Audeze LCD-4z measurements and analysis
> added 08-17: Sennheiser HD820 measurements and analysis
> added 08-13: Powerbank output keep-alive circuit for powering low present gadgets
> added 07-02: MrSpeakers Ether measurements and analysis
> added 07-01: Superlux HD687 measurements, mods and analysis
up to date 07-01Sennheiser HD58X Jubilee added some plots
> added 06-27: AKG K92 measurements and analysis
> added 06-26Beyerdynamic Amiron Wireless measurements
> added 06-25: Sennheiser HD599 measurements
up to date 06-25Sennheiser HD58X Jubilee measurements and analysis
> added 06-24: Audeze LCD-2 Classic measurements
> added 06-24: Audeze LCD-MX4 measurements
> added 06-23: Sennheiser HD569 measurements
> added 06-23: HIFIMAN Sundara measurements
> added 06-23: Final D8000 measurements and analysis
> added 06-21: HIFIMAN Ananda measurements and analysis
> added 06-08: Mitchell & Johnson  JP1 DJ measurements
> added 05-26: Beyerdynamic DT 880 Edition treble modification
up to date 05-20: 3rd-party-plots helpful hyperlinks to different measurement websites
up to date 04-24: Beyerdynamic DT 880 Edition (250Ω) measurements
up to date 04-07: Kameleon filter list.
> added 04-01: Superlux HD671 measurements and analysis
up to date 03-17: Passive filter for Master & Dynamic MH40 added
> added 03-14: Master & Dynamic MH40 measurements
> added 03-12: Beyerdynamic DT 880 Edition (250Ω) measurements
> added 02-17: Superlux HD672 measurements and analysis
> added 02-10: Takstar PRO 82 monitor measurements and analysis
up to date 01-21: Superlux HD688 manufacturing model measurements


——————– 2018 ————————
——————– 2017 ————————

beneath: date format MMDD

up to date 12-26: pdf with extra Sennheiser HD58X measurements and experiments
> added 12-21: Sennheiser HD58X Jubilee (Massdrop) measurements and impressions
> added 11:25: MrSpeakers ÆON Open measurements and impressions
> added 11:23: Focal Clear measurements and impressions
> added 11:02: MrSpeakers ÆON Closed measurements
> added 11:02: MrSpeakers Ether flow (open) measurements
> added 11:02: MrSpeakers Ether C flow (closed) measurements
up to date 11:02: Sennheiser HD660S measurements with HD600 comparo.
> added 10-28: HIFIMAN Susvara measurements
> added 10-28: Grado GS2000e measurements
> added 10-28: Audeze LCD-4 measurements
> added 10:26: JBL E40 BT measurements
> added 10:25: Sennheiser HD800S measurements
> added 10:24: Sennheiser HD660S measurements.
up to date 10-08: Denon AH-D600 modifications measurements.
up to date 09-21: Sennheiser HD250 linear II measurements.
up to date 09-19AKG K501 measurements with some experiments.
> added 09-08AKG K501 measurements.
> added 09-06: HIFIMAN HE-6 (early 4-screw model) measurements.
> added 08-10: Creative Sound BlasterX H7 Tournament measurements.
> added 07-20: HIFIMAN HE1000 measurements
> added 07-19HIFIMAN Edition S and Edition X measurements
> added 07-18HIFIMAN HE400S and HE-560 measurements
up to date 07-17: HIFIMAN HE400i measurements
> added 07-16: Beyerdynamic T1 (mk2) and T5P (mk2) measurements
> added 07-16: Beyerdynamic DT 1770 Pro and DT 1990 Pro measurements
> added 07-15: Focal Utopia and Listen measurements
> added 07-14: Focal Elear measurements
> added 07-13: Sennheiser Momentum 2 (over-ear) measurements
> added 07-12: Sennheiser HD250 linear II measurements
> added 07-11: Sennheiser HD630VB measurements
> added 07-10: Sennheiser HD700 measurements
> added 07-10: Sennheiser HD 2.20 measurements
> added 07-09: V-MODA crossfade II wireless measurements
> added 07-08: V-MODA Crossfade M100 measurements
> added 07-08: Final Sonorous III measurements
> added 07-07: Denon AH-D600 measurements
> added 07-07: Audeze Sine measurements
> added 07-05: Audeze LCD-3, LCD-X and LCD-XC measurements
> added 07-05: Meze 99 classics and 99 neo measurements.
> added 07-04: Audeze EL-8 open, EL-8 Titanium and LCD-2
> added 07-03: Beyerdynamic Amiron measurements.
up to date 07-01: Foobar Tutorials
up to date 06-23: Cables article
> added 06-17: Balanced attenuators in attenuator and power-amp sections.
up to date 06-04: Foobar tutorial part 2
> added 06-03: Battery circuit change for Kameleon and Kameleon 2 transportable amps.
up to date 06-01: supported Kameleon modules checklist
up to date 04-17: extra Roland RH-300 measurements.
> added 04-08: Roland RH-300 measurements.
up to date 03-18: modified the how to interpret graphs tree-structure
up to date 03-12: added data to the how to interpret graphs article
> added 03-08: t.bone HD 990 D headphone in measurements
up to date 03-03: supported Kameleon modules checklist
> added 03-01: Superlux HD687 (prototype) measurements
up to date 02-18: Fostex TH-X00 and Fostex T50RP mk3 measurements
> added 02-11: Fostex TH-X00 (Mahogany) in measurements|Fostex
> added 02-07: Fostex T50RP mk3 in measurements|Fostex
> added 02-05: Superlux HD688 (prototype) measurements
> added 01-24: Compressing DSD files with Wavpack 5 tutorial
up to date 01-09: Kameleon-2 Desktop and Portable amp construct manuals
up to date 01-02: Headphone attenuator adapter article

——————– 2016 ————————
——————– 2015 ————————

beneath: date format MMDD

up to date 12-31: Foobar tutorials
up to date 12-08: ATH-MSR7 turned out to be pretend, moved to crap section
> added 11-26: Devoted Kameleon page
up to date 11-16: HiFiman HE-350 measurements
up to date 10-29: supported headphone checklist for Kameleon
up to date 10-20: HiFiman HE-350 measurements (2nd HE350 + seal)
> added 10-19: Veclan Monk+ in measurements
> added 10-19: FAKE audio-technica ATH-MSR7 measurements
up to date 10-12: Re-arranged the measurements section
> added 10-08: repair for HiFiman HE-350 treble  in measurements|HIFIMAN
> added 10-08: HiFiman HE-350 measurements in measurements|HIFIMAN
up to date 10-03: Kameleon articles (extra filter modules added) in schematics|headphone
> added 09-17: Sony MDR-100AAP measurements in measurements|Sony
> added 09-15: Pre-production Superlux HD581 in measurements|Superlux
> added 09-12: Sony MDR-1A measurements in measurements|Sony
> added 09-04: In-line Kameleon guide
up to date 09-04: Kameleon-2 desktop and portable amp manuals
> added 08-24: My views on ‘neutral sound‘ in learn
> added 08-06: Affect of Fletcher-Munson on listening pleasure in learn
> added 07-28: Taming the treble article in headphones|taming the treble
up to date 07-27: How to interpret graphs, added interior|constancy compensation.
> added 06-19: Philips SHB-9850NC measurements in measurements|Philips
up to date 06-01: headphone power table in learn|articles
> added 06-01: Beyerdynamic DT150 measurements in measurements|Beyerdynamic
up to date 05-26: Headphone adapter article in learn|Power-amp-adapter
up to date 05-21: Superlux HD662-EVO measurements in measurements|Superlux
up to date 05-14: data about SMPS vs LPS energy provides in learn|energy provide sorts
>added 05-04: Ausdom ANC7 measurements in measurements|Ausdom
>added 04-15: Schematic G1217 challenge Ember rev. 2.1 in schematics|amplifier
up to date 03-09 AudioQuest NightHawk cable in measurements|AudioQuest
>added 03-03: AudioQuest NightHawk measurements in measurements|AudioQuest
> added 02-23: Kameleon 2 DESKTOP build manual
up to date 02-21: Kameleon 2 PORTABLE build manual
> added 01-31: Superlux HD662-EVO measurements in measurements|Superlux
> added 01-28: HiFiMan HE-400i measurements in measurements|HIFIMAN
> added 01-24: Beats Studio Wi-fi measurements in measurements|Beats
up to date 01-24: Ausdom M05 measurements in measurements|Ausdom
> added 01-08: Sennheiser HD700 passive filter in schematics|headphone related

——————– 2016 ————————
——————– 2015 ————————

beneath: date format MM-DD

up to date 12-24: Some headphone measurements have been up to date.
> added 12-24: Bose Quiet Comfort 25 in measurements|Bose
> added 12-19: Bravo Ocean modifications in schematics|amplifiers
> added 12-16: Kameleon-2 article.
up to date 12-13: Philips cityscape uptown in measurements|Philips
up to date 12-02: Superlux HD681 and HD681-EVO in measurements|Superlux
> added 12-02: Superlux HD572-SP measurements in measurements|Superlux
> added 11-19: Passive filters for some Hifiman fashions in schematics|headphone
> added 11-18: Sennheiser HD800 measurements in measurements|Sennheiser
> added 11-13: Foobar tutorial part 3 SACD plugin in digital|software
up to date 11-12: But some extra measurements in Sennheiser HD650 modifications.
up to date 11-02: Foobar tutorial about taking part in DSD in digital|PC software.
> added 11-01: created a download section with articles/schematics and so on.
up to date 10-18: Even extra measurements on Sennheiser HD650 modifications.
up to date 10-15: Foobar 2000 for dummies in digital|PC software.
up to date 09-17: added data about square-waves in explanations|how to interpret graphs
up to date 09-17: Details about listening ranges in learn|power etc.
> added 09-13: In depth measurements on Sennheiser HD650 modifications.
> added 09-12: Passive inline filter for some HIFIMAN headphones
> added 08-23: Some ramblings about DR, distortion and SPL in learn|DR
up to date 08-13: Ostay-Welti goal curve in explanations|how to interpret graphs
up to date 08-11: Headphone correction filter article
> added 06-29: Information about headphone attenuators for IEM’s and delicate headphones.
up to date 06-17: details about energy provides in learn|power supplies
up to date 05-23: Headphone correction filter guide in schematics|headphone
> added 05-02: Schematics for the ‘SeNNator‘ amplifier in schematics|amplifier
up to date 05-07: Kameleon article in schematics|headphone
> added 05-02: Measurements of Sennheiser HD600 and Ultrasone HFI-780
> added 04-23: Schematics for the newest variations of a number of G1217 amps.
up to date 04-19: Philips uptown article (added data about securing the pads)
up to date 04-12: Added some data on tubes in amplifiers|hybrid
up to date 03-21: Kameleon and filter article in schematics|headphone
> added 03-08: An in depth article about the Superlux HD562 in pdf format.
> added 02-28: Beyerdynamic DT770Pro-250 and DT990Pro-250  in headphones|measurements
> added 02-27: Grado SR125i measurements in headphones|measurements
> added 02-27: AKG K612 measurements in headphones|measurements
> added 02-18: Superlux HD562 measurements in headphones|measurements
up to date 02-07: FiiO and Sansa measurements in Digital|Digital Audio Players
> added 02-06: Schematic of challenge Solstice in schematics|amplifier
up to date 02-04: Added plots from Kameleon amp in schematics|headphone
up to date 02-02: Philips SHL9505-GY plots in headphones|measurements
> added 01-28: Information about HD650 pads in headphones|measurements
up to date 01-26: Information on rectifiers in learn|power supply/filters
> added 01-21: ARTA setup information by BMF in learn|articles
> added 01-20: my views on ‘burn-in‘ in learn|burn-in
up to date 01-11: the headphones|recommended ones part.

——————– 2015 ————————
——————– 2014 ————————

beneath: date format MM-DD

up to date 12-28: The AKG K518-DJ in headphone|measurements
> added 12-24: Philips Cityscape Uptown SHL9505 in headphones|measurements
up to date 12-24: modified the format of headphones|measurements
> added 12-16: Schematic of a tube buffer circuit in Schematics|Amplifier
> added 11-16: Some data about measurements and disclaimer in headphones|measurements
> added 11-13: Article about dB: do deciBells ring a bell ? in learn|do decibells
up to date 10-04: Philips A5 Professional with PCU110 velours pads measurements in headphones|measurements
> added 10-01: Philips A5 Professional measurements in headphones|measurements
up to date 09-10: Kameleon article (added Sennheiser Momentum)
> added 09-04: Some further data about getting an excellent ‘seal’ of headphones in just a few pages.
> added 08-20: Project Polaris schematic in Schematics|Amplifier
> added 08-14: Measurements of Sansa Clip Sport, Fuze and FiiO X3 in digital|DAP
up to date 08-10: Some data added in schematics|amplifier part
up to date 08-09: headphone power table
> added 07-13: AKG K181 / K400 / K500 & Beyerdynamic DT250-250 in headphones|measurements
> added 07-09: Superlux HD-685 analysis and modifications in Schematics|Headphone
> added 07-05: DIY Woodies made by ‘Stratocaster’ in headphones|measurements
> added 06-25: Philips SHP-9500 and Superlux HD685 in headphones|measurements
> added 06-13: Philips Fidelio X1 in  headphones|measurements
up to date 06-11: Beyerdynamic DT1350-SL pad measurements in headphones|measurements
> added 05-29: Audio Technica ATH-M40X modifications in  headphones|measurements
> added 05-27: Audio Technica ATH-M40X in  headphones|measurements
up to date 05-22: Headphone correction filter article in Schematics|Headphone
up to date 05-19: headphones|recommended ones web page.
up to date 05-14: added headphone(s) to the Kameleon article in schematics|amplifier.
up to date 05-14: Kameleon article and headphone power table
> added 04-28: Kameleon transportable headphone amplifier article in schematics|amplifier
> added 04-19: Some details about regulators in Explanations|power supplies.
up to date 04-09: Tascam TH-02 mods in  headphones|measurements
> added 03-19: An part about effectivity in Explanations|power, impedance.
up to date 03-18: The Explanations|how to interpret graphs part with Olive-Welti curve.
> added 03-17: Beyerdynamic T90 passive highs/peak filter in schematics|headphone.
> added 03-16: How LOUD we pay attention, what energy we’d like for it ?  Explanations|power, impedance.
up to date 02-17: Beyerdynamic T50P/DT1350 pad measurements in headphones|measurements
> added 02-10: added Dawn-III and Horizon-III in schematics|amplifier
up to date 02-02: up to date model of the impedance/resistance article in learn|power, impedance .
> added 01-26: Tascam TH02 and AKG K550 measurements in headphones|measurements.
up to date 01-24: Foobar for dummies tutorial.
up to date 01-19: Koss KSC75 measurements with Kramer mod in headphones|measurements .
> added 01-18: Yello album opinions in music|album reviews part.
> added 01-15: Koss PortaPro measurements within the headphones|measurements part.
> added 01-12: Some data on the snubbering of diodes in rectifiers.
up to date 01-03: the headphones|recommended ones part.

——————– 2014 ————————
——————– 2013 ————————

beneath: date format MM-DD

up to date 12-22: Modified the format of the headphones|measurements part.
up to date 12-17: How a lot energy do you want ? solutions in:  learn|power, impedance.
> added 12-11: How a lot energy do you want ? solutions in:  learn|power, impedance.
> added 12-08: AKG K551 modification article within the schematics|headphone part.
> added 12-05: AKG K551 and Beyerdynamic T50P measurements in headphones|measurements
up to date 11-24: Superlux HD681-EVO article within the schematics|headphone part.
> added 11-14: Superlux HD681 substitute pad measurements in schematics|headphone
up to date 11-06: Added some headphones to the filter PCB article.
up to date 10-30: Some headphone cable measurements within the cable part.
> added 10-23: Teufel Aureol® Actual within the headphones|measurements part.
up to date 09-25: Superlux HD681-EVO newer model within the schematics|headphone part.
> added 09-18: SFI drivers DIY headphone within the headphones|measurements part.
> added 09-07: Superlux HD681-EVO modifications within the schematics|headphone part.
up to date 08-30: Power amp adapter circuit added.
up to date 08-25: Power supply article with additional information to restore SMPS
> added 08-21: Superlux HD681-EVO within the headphones|measurements part.
up to date 08-15: Power supply article with additional information on mains transformers
up to date 08-12: Power supply article with additional information on mains filters
> added 07-17: Plots of DT990-600 and KSC75  in headphones|measurements
> added 07-15: Some details about mains filters within the power supplies section
up to date 07-14: modified the location navigation barely.
up to date 07-12: Jays V-Jays within the headphones|measurements part.
> added 07-11Silverscrest KH-2347 plots within the headphones|measurements part.
> added 07-02: HD25-1 / HD 320 / HD215, Philips SHP-9000 in headphones|measurements
> added 06-27: Sony MDR-XB500 plots within the headphones|measurements part
up to date 06-30: Power supply article with further drawings and data
> added 06-25: Classic Stax SR-5 with SRD-6headphones|measurements
up to date 06-23: Headphones part and added some footage
> added 06-18: Details about amplifiers and the way they work
up to date 06-09: HD681 plots within the headphones|measurements part
> added 06-08: Easy rechargeable battery monitoring circuit schematic
> added 06-02: Overview of Handel’s Messiah
> added 05-31: Overview of Deep Purple’s album ‘Now What
> added 05-26: Anecdotal a couple of cable swap
> added 05-25: a hyperlink to an unimaginable quantity of audio related online calculators and explanations
> added 05-23:Some data on completely different headphone driver types.
> added 05-18: Technical data about Project Starlight & Ember
> added 05-15: the HD681 revisited a brand new article in regards to the filter and extra background data
up to date 05-12: the Headphone Correction Filter guide
> added 05-11: evaluate of the band TinyFish in Rock/Pop reviews
> added 05-07: Overview of Sennheiser RS160 – wi-fi headphones by Jeff.
> added 05-07: schematics of two new hybrid amplifiers.
> added 05-07: Some findings about DIY headphone measurement rigs.
up to date 05-02: the Headphone Correction Filter guide and T40RP-mkII / T50RP manuals.
> added 04-28: details about the NEW Headphone Correction Filter circuit.
> added 04-14: evaluate of the O2 headphone amplifier
up to date 04-13: The new filter PCB a sneak preview
up to date 04-10: Power supply article
> added 04-09: Measurements of some headphones.
> added 04-05: a part of the article on the utilization of speaker amplifiers for driving headphones.
> added 04-03: Web page with all headphone reviews on one web page.
> added 04-02: headphone reviews
up to date 03-31: Power supply article
> added 03-31: article about crossfeed.
> added 03-30: we added a FORUM along with the remark replies.
up to date 03-29: Rock & Pop album reviews
> added 03-28: Some details about rectifiers in energy provides
2013-03-08: Web site was created

——————– 2013 ————————

> added 04-30: HIFIMAN HE400i (2020) measurements, analysis
up to date 04-18: Beyerdynamic DT990/250 article
> added 04-16: Beyerdynamic DT 700 PRO X measurements, analysis and modification.
up to date 04-05: moved the headphone filter web page
> added 04-02: Røde NTH-100 measurements and analysis
> added 03-18: Brainwavz HM5 measurements and analysis
> added 02-26: AKG K514-mkII measurements and analysis
> added 02-06: Beyerdynamic DT 240 Pro measurements, analysis and modification
> added 02-03: Pioneer SE-M5ST measurements and analysis
> added 02-02: audio-technica ATH-A700X measurements and analysis
> added 01-24: Beyerdynamic T51i measurements and analysis
> added 01-23: Sennheiser HD430 measurements and analysis
up to date 01-09: HIFIMAN HE35X article, added modification.


——————– 2022 ————————
——————– 2021 ————————

beneath: date format MMDD

up to date 12-30: Selling some headphones (inside E.U. solely, sorry)
> added 12-24: Sony MDR-ZX110 measurements and analysis
> added 12-18: BRAINZ H10 measurements and analysis
> added 12-10: HIFIMAN HE400se measurements and analysis
> added 12-05: Koss KPH30i measurements, analysis and modification
> added 11-29: Sennheiser PXC550-II measurements and analysis
> added 11-24: Sony MDR-7509 HD measurements and analysis
> added 11-11: JBL TUNE 710 BT measurements and analysis
> added 11-01: Beyerdynamic DT 900 PRO X measurements and analysis
> added 10-04: Sennheiser HD590 Prestige measurements and analysis
> added 10-03: Beyerdynamic TYGR 300 R measurements and analysis
> added 10-02: Devine PRO 4000 measurements, analysis and modification
> added 09-16: audio-technica ATH-M50X measurements and analysis
> added 08-23: Sennheiser HD595 (SE) measurements and analysis
> added 08-22: DAP audio: HP-280 Pro measurements, analysis and modification
> added 07-25: Sennheiser HD560 Ovation II measurements, analysis and modification
> added 07-16: Sennheiser HD414 (unique 2kΩ model) measurements
up to date 07-09: Measured the brand new (2021) Sennheiser pads for HD6** collection in article about earpads
> added 05-22: Sennheiser HD570 Symphony measurements and analysis
up to date 05-02: HIFIMAN HE560(v2) measurements
> added 04-18: Shure SRH-440 measurements and analysis
> added 04-10: Superlux HD330 measurements, analysis and modification.
up to date 04-03: added Sennheiser HD800 replacement pad measurements.
up to date 03-25: AKG K702 measurements, added bass port mod measurements
> added 02-22: Behringer BH-470 measurements, analysis and modification
> added 02-06: Article about earpads
> added 01-23: Superlux HD660Pro (proto) measurements, analysis and modifications
> added 01-19: audio-technica ATH-SR9 measurements, analysis and modifications
up to date 01-06: Audeze Sine measurements, analysis and modifications


——————– 2021 ————————
——————– 2020 ————————

beneath: date format MMDD

up to date 12-13: Sennheiser HD800S article
> added 12-13: AKG: N60NC (wired) measurements and analysis
> added 11-16: Sennheiser HD559 measurements, analysis and modifications.
> added 11-02: Inner|Fidelity measurement collection PDF accomplished & alphabetical
up to date 10-08: headphone power table
> added 09-24: Sennheiser HD560S measurements and analysis
up to date 08-08: AKG K702 K712 & K7XX measurements .
> added 08-01: AKG K712 measurements and analysis.
> added 07-26: Beyerdynamic DT 880-600 measurements and analysis.
> added 06-27: Shure SRH-1440 measurements and analysis
> added 06-24: Shure SRH-840 measurements and analysis
up to date 06-14: DT880 Black SE and HD800 pages, added new data
> added 06-07: Beyerdynamic DT 880 Black SE measurements, modifications
> added 04-30: AKG K361 measurements and analysis.
> added 04-19: AKG K371 measurements and analysis.
> added 03-25: Roland RH-5 measurements and analysis.
> added 02-03: AKG K702 measurements, analysis and treble ‘repair’
up to date 02-02: measurements added of a ‘veiled’ HD650 (not a fable)
> added 01-22: Shure SRH-1840 measurements and analysis.
> added 01-19: Shure SRH-1540 measurements and analysis.


——————– 2020 ————————
——————– 2019 ————————

beneath: date format MMDD

> added 11-14: Philips Fidelio X2HR measurements and analysis.
> added 10-11: audio-technica ATH-MSR7 measurements and analysis.
> added 10-10: Yamaha HPH-MT220 measurements and analysis.
> added 09-15: extra passive filters
> added 08-30: AKG K812 measurements, analysis.
up to date 08-17: Beyerdynamic DT1770 measurements, analysis and modification
up to date 08-11: Beyerdynamic DT1990 measurements, analysis and modification
> added 07-13: classic Sennheiser HD420 SL restoration and analysis
> added 07-11: Sennheiser HD 4.40 BT measurements and analysis
> added 06-16: 1MORE Triple Driver Over-Ear measurements and analysis
up to date 06-16: NAD VISO HP50 added passive filter schematic
up to date 06-15: measurements of current Romanian produced HD58X
> added 05-19: Grundig EE1178 (BlueTooth) measurements and analysis
> added 05-19: Denon AH-GC20 (B.T. / N.C.) measurements and analysis
> added 05-15: Bose QC35-II (B.T. / N.C.) measurements and analysis
> added 04-03HIFIMAN HE35X measurements and analysis
> added 03-31: AKG K701 measurements and analysis
> added 03-10: Sony WH-1000X-M3 (B.T. / N.C.) measurements and analysis
> added 03-09Sony WH-CH700N (B.T. / N.C.) measurements and analysis
> added 01-24: HIFIMAN Edition XX measurements, analysis, modification
> added 01-12: AKG K7XX (Massdrop) measurements and analysis
up to date 01-02: Superlux HD681 measurements


——————– 2019 ————————
——————– 2018 ————————

beneath: date format MMDD

up to date 12-27: Massdrop HD58X modifications article
> added 12-08: Marshall Major II Bluetooth measurements and analysis
up to date 11-18: Some additional information on Koss KSC75 earphones
> added 10-21: A for sale section the place some reviewed gear is up on the market
> added 10-17: Beyerdynamic T51p measurements and analysis
up to date 10-07Beyerdynamic Custom One Pro with COPPlus measurements.
> added 09-29: NAD VISO HP50 measurements and analysis
> added 08-26Beyerdynamic Custom One Pro measurements, analysis and modifications
> added 08-25: Pioneer SE-305 measurements and analysis
> added 08-19: Campfire Audio Cascade measurements and analysis
> added 08-18: Audeze LCD-4z measurements and analysis
> added 08-17: Sennheiser HD820 measurements and analysis
> added 08-13: Powerbank output keep-alive circuit for powering low present gadgets
> added 07-02: MrSpeakers Ether measurements and analysis
> added 07-01: Superlux HD687 measurements, mods and analysis
up to date 07-01Sennheiser HD58X Jubilee added some plots
> added 06-27: AKG K92 measurements and analysis
> added 06-26Beyerdynamic Amiron Wireless measurements
> added 06-25: Sennheiser HD599 measurements
up to date 06-25Sennheiser HD58X Jubilee measurements and analysis
> added 06-24: Audeze LCD-2 Classic measurements
> added 06-24: Audeze LCD-MX4 measurements
> added 06-23: Sennheiser HD569 measurements
> added 06-23: HIFIMAN Sundara measurements
> added 06-23: Final D8000 measurements and analysis
> added 06-21: HIFIMAN Ananda measurements and analysis
> added 06-08: Mitchell & Johnson  JP1 DJ measurements
> added 05-26: Beyerdynamic DT 880 Edition treble modification
up to date 05-20: 3rd-party-plots helpful hyperlinks to different measurement websites
up to date 04-24: Beyerdynamic DT 880 Edition (250Ω) measurements
up to date 04-07: Kameleon filter list.
> added 04-01: Superlux HD671 measurements and analysis
up to date 03-17: Passive filter for Master & Dynamic MH40 added
> added 03-14: Master & Dynamic MH40 measurements
> added 03-12: Beyerdynamic DT 880 Edition (250Ω) measurements
> added 02-17: Superlux HD672 measurements and analysis
> added 02-10: Takstar PRO 82 monitor measurements and analysis
up to date 01-21: Superlux HD688 manufacturing model measurements


——————– 2018 ————————
——————– 2017 ————————

beneath: date format MMDD

up to date 12-26: pdf with extra Sennheiser HD58X measurements and experiments
> added 12-21: Sennheiser HD58X Jubilee (Massdrop) measurements and impressions
> added 11:25: MrSpeakers ÆON Open measurements and impressions
> added 11:23: Focal Clear measurements and impressions
> added 11:02: MrSpeakers ÆON Closed measurements
> added 11:02: MrSpeakers Ether flow (open) measurements
> added 11:02: MrSpeakers Ether C flow (closed) measurements
up to date 11:02: Sennheiser HD660S measurements with HD600 comparo.
> added 10-28: HIFIMAN Susvara measurements
> added 10-28: Grado GS2000e measurements
> added 10-28: Audeze LCD-4 measurements
> added 10:26: JBL E40 BT measurements
> added 10:25: Sennheiser HD800S measurements
> added 10:24: Sennheiser HD660S measurements.
up to date 10-08: Denon AH-D600 modifications measurements.
up to date 09-21: Sennheiser HD250 linear II measurements.
up to date 09-19AKG K501 measurements with some experiments.
> added 09-08AKG K501 measurements.
> added 09-06: HIFIMAN HE-6 (early 4-screw model) measurements.
> added 08-10: Creative Sound BlasterX H7 Tournament measurements.
> added 07-20: HIFIMAN HE1000 measurements
> added 07-19HIFIMAN Edition S and Edition X measurements
> added 07-18HIFIMAN HE400S and HE-560 measurements
up to date 07-17: HIFIMAN HE400i measurements
> added 07-16: Beyerdynamic T1 (mk2) and T5P (mk2) measurements
> added 07-16: Beyerdynamic DT 1770 Pro and DT 1990 Pro measurements
> added 07-15: Focal Utopia and Listen measurements
> added 07-14: Focal Elear measurements
> added 07-13: Sennheiser Momentum 2 (over-ear) measurements
> added 07-12: Sennheiser HD250 linear II measurements
> added 07-11: Sennheiser HD630VB measurements
> added 07-10: Sennheiser HD700 measurements
> added 07-10: Sennheiser HD 2.20 measurements
> added 07-09: V-MODA crossfade II wireless measurements
> added 07-08: V-MODA Crossfade M100 measurements
> added 07-08: Final Sonorous III measurements
> added 07-07: Denon AH-D600 measurements
> added 07-07: Audeze Sine measurements
> added 07-05: Audeze LCD-3, LCD-X and LCD-XC measurements
> added 07-05: Meze 99 classics and 99 neo measurements.
> added 07-04: Audeze EL-8 open, EL-8 Titanium and LCD-2
> added 07-03: Beyerdynamic Amiron measurements.
up to date 07-01: Foobar Tutorials
up to date 06-23: Cables article
> added 06-17: Balanced attenuators in attenuator and power-amp sections.
up to date 06-04: Foobar tutorial part 2
> added 06-03: Battery circuit change for Kameleon and Kameleon 2 transportable amps.
up to date 06-01: supported Kameleon modules checklist
up to date 04-17: extra Roland RH-300 measurements.
> added 04-08: Roland RH-300 measurements.
up to date 03-18: modified the how to interpret graphs tree-structure
up to date 03-12: added data to the how to interpret graphs article
> added 03-08: t.bone HD 990 D headphone in measurements
up to date 03-03: supported Kameleon modules checklist
> added 03-01: Superlux HD687 (prototype) measurements
up to date 02-18: Fostex TH-X00 and Fostex T50RP mk3 measurements
> added 02-11: Fostex TH-X00 (Mahogany) in measurements|Fostex
> added 02-07: Fostex T50RP mk3 in measurements|Fostex
> added 02-05: Superlux HD688 (prototype) measurements
> added 01-24: Compressing DSD files with Wavpack 5 tutorial
up to date 01-09: Kameleon-2 Desktop and Portable amp construct manuals
up to date 01-02: Headphone attenuator adapter article

——————– 2016 ————————
——————– 2015 ————————

beneath: date format MMDD

up to date 12-31: Foobar tutorials
up to date 12-08: ATH-MSR7 turned out to be pretend, moved to crap section
> added 11-26: Devoted Kameleon page
up to date 11-16: HiFiman HE-350 measurements
up to date 10-29: supported headphone checklist for Kameleon
up to date 10-20: HiFiman HE-350 measurements (2nd HE350 + seal)
> added 10-19: Veclan Monk+ in measurements
> added 10-19: FAKE audio-technica ATH-MSR7 measurements
up to date 10-12: Re-arranged the measurements section
> added 10-08: repair for HiFiman HE-350 treble  in measurements|HIFIMAN
> added 10-08: HiFiman HE-350 measurements in measurements|HIFIMAN
up to date 10-03: Kameleon articles (extra filter modules added) in schematics|headphone
> added 09-17: Sony MDR-100AAP measurements in measurements|Sony
> added 09-15: Pre-production Superlux HD581 in measurements|Superlux
> added 09-12: Sony MDR-1A measurements in measurements|Sony
> added 09-04: In-line Kameleon guide
up to date 09-04: Kameleon-2 desktop and portable amp manuals
> added 08-24: My views on ‘neutral sound‘ in learn
> added 08-06: Affect of Fletcher-Munson on listening pleasure in learn
> added 07-28: Taming the treble article in headphones|taming the treble
up to date 07-27: How to interpret graphs, added interior|constancy compensation.
> added 06-19: Philips SHB-9850NC measurements in measurements|Philips
up to date 06-01: headphone power table in learn|articles
> added 06-01: Beyerdynamic DT150 measurements in measurements|Beyerdynamic
up to date 05-26: Headphone adapter article in learn|Power-amp-adapter
up to date 05-21: Superlux HD662-EVO measurements in measurements|Superlux
up to date 05-14: data about SMPS vs LPS energy provides in learn|energy provide sorts
>added 05-04: Ausdom ANC7 measurements in measurements|Ausdom
>added 04-15: Schematic G1217 challenge Ember rev. 2.1 in schematics|amplifier
up to date 03-09 AudioQuest NightHawk cable in measurements|AudioQuest
>added 03-03: AudioQuest NightHawk measurements in measurements|AudioQuest
> added 02-23: Kameleon 2 DESKTOP build manual
up to date 02-21: Kameleon 2 PORTABLE build manual
> added 01-31: Superlux HD662-EVO measurements in measurements|Superlux
> added 01-28: HiFiMan HE-400i measurements in measurements|HIFIMAN
> added 01-24: Beats Studio Wi-fi measurements in measurements|Beats
up to date 01-24: Ausdom M05 measurements in measurements|Ausdom
> added 01-08: Sennheiser HD700 passive filter in schematics|headphone related

——————– 2016 ————————
——————– 2015 ————————

beneath: date format MM-DD

up to date 12-24: Some headphone measurements have been up to date.
> added 12-24: Bose Quiet Comfort 25 in measurements|Bose
> added 12-19: Bravo Ocean modifications in schematics|amplifiers
> added 12-16: Kameleon-2 article.
up to date 12-13: Philips cityscape uptown in measurements|Philips
up to date 12-02: Superlux HD681 and HD681-EVO in measurements|Superlux
> added 12-02: Superlux HD572-SP measurements in measurements|Superlux
> added 11-19: Passive filters for some Hifiman fashions in schematics|headphone
> added 11-18: Sennheiser HD800 measurements in measurements|Sennheiser
> added 11-13: Foobar tutorial part 3 SACD plugin in digital|software
up to date 11-12: But some extra measurements in Sennheiser HD650 modifications.
up to date 11-02: Foobar tutorial about taking part in DSD in digital|PC software.
> added 11-01: created a download section with articles/schematics and so on.
up to date 10-18: Even extra measurements on Sennheiser HD650 modifications.
up to date 10-15: Foobar 2000 for dummies in digital|PC software.
up to date 09-17: added data about square-waves in explanations|how to interpret graphs
up to date 09-17: Details about listening ranges in learn|power etc.
> added 09-13: In depth measurements on Sennheiser HD650 modifications.
> added 09-12: Passive inline filter for some HIFIMAN headphones
> added 08-23: Some ramblings about DR, distortion and SPL in learn|DR
up to date 08-13: Ostay-Welti goal curve in explanations|how to interpret graphs
up to date 08-11: Headphone correction filter article
> added 06-29: Information about headphone attenuators for IEM’s and delicate headphones.
up to date 06-17: details about energy provides in learn|power supplies
up to date 05-23: Headphone correction filter guide in schematics|headphone
> added 05-02: Schematics for the ‘SeNNator‘ amplifier in schematics|amplifier
up to date 05-07: Kameleon article in schematics|headphone
> added 05-02: Measurements of Sennheiser HD600 and Ultrasone HFI-780
> added 04-23: Schematics for the newest variations of a number of G1217 amps.
up to date 04-19: Philips uptown article (added data about securing the pads)
up to date 04-12: Added some data on tubes in amplifiers|hybrid
up to date 03-21: Kameleon and filter article in schematics|headphone
> added 03-08: An in depth article about the Superlux HD562 in pdf format.
> added 02-28: Beyerdynamic DT770Pro-250 and DT990Pro-250  in headphones|measurements
> added 02-27: Grado SR125i measurements in headphones|measurements
> added 02-27: AKG K612 measurements in headphones|measurements
> added 02-18: Superlux HD562 measurements in headphones|measurements
up to date 02-07: FiiO and Sansa measurements in Digital|Digital Audio Players
> added 02-06: Schematic of challenge Solstice in schematics|amplifier
up to date 02-04: Added plots from Kameleon amp in schematics|headphone
up to date 02-02: Philips SHL9505-GY plots in headphones|measurements
> added 01-28: Information about HD650 pads in headphones|measurements
up to date 01-26: Information on rectifiers in learn|power supply/filters
> added 01-21: ARTA setup information by BMF in learn|articles
> added 01-20: my views on ‘burn-in‘ in learn|burn-in
up to date 01-11: the headphones|recommended ones part.

——————– 2015 ————————
——————– 2014 ————————

beneath: date format MM-DD

up to date 12-28: The AKG K518-DJ in headphone|measurements
> added 12-24: Philips Cityscape Uptown SHL9505 in headphones|measurements
up to date 12-24: modified the format of headphones|measurements
> added 12-16: Schematic of a tube buffer circuit in Schematics|Amplifier
> added 11-16: Some data about measurements and disclaimer in headphones|measurements
> added 11-13: Article about dB: do deciBells ring a bell ? in learn|do decibells
up to date 10-04: Philips A5 Professional with PCU110 velours pads measurements in headphones|measurements
> added 10-01: Philips A5 Professional measurements in headphones|measurements
up to date 09-10: Kameleon article (added Sennheiser Momentum)
> added 09-04: Some further data about getting an excellent ‘seal’ of headphones in just a few pages.
> added 08-20: Project Polaris schematic in Schematics|Amplifier
> added 08-14: Measurements of Sansa Clip Sport, Fuze and FiiO X3 in digital|DAP
up to date 08-10: Some data added in schematics|amplifier part
up to date 08-09: headphone power table
> added 07-13: AKG K181 / K400 / K500 & Beyerdynamic DT250-250 in headphones|measurements
> added 07-09: Superlux HD-685 analysis and modifications in Schematics|Headphone
> added 07-05: DIY Woodies made by ‘Stratocaster’ in headphones|measurements
> added 06-25: Philips SHP-9500 and Superlux HD685 in headphones|measurements
> added 06-13: Philips Fidelio X1 in  headphones|measurements
up to date 06-11: Beyerdynamic DT1350-SL pad measurements in headphones|measurements
> added 05-29: Audio Technica ATH-M40X modifications in  headphones|measurements
> added 05-27: Audio Technica ATH-M40X in  headphones|measurements
up to date 05-22: Headphone correction filter article in Schematics|Headphone
up to date 05-19: headphones|recommended ones web page.
up to date 05-14: added headphone(s) to the Kameleon article in schematics|amplifier.
up to date 05-14: Kameleon article and headphone power table
> added 04-28: Kameleon transportable headphone amplifier article in schematics|amplifier
> added 04-19: Some details about regulators in Explanations|power supplies.
up to date 04-09: Tascam TH-02 mods in  headphones|measurements
> added 03-19: An part about effectivity in Explanations|power, impedance.
up to date 03-18: The Explanations|how to interpret graphs part with Olive-Welti curve.
> added 03-17: Beyerdynamic T90 passive highs/peak filter in schematics|headphone.
> added 03-16: How LOUD we pay attention, what energy we’d like for it ?  Explanations|power, impedance.
up to date 02-17: Beyerdynamic T50P/DT1350 pad measurements in headphones|measurements
> added 02-10: added Dawn-III and Horizon-III in schematics|amplifier
up to date 02-02: up to date model of the impedance/resistance article in learn|power, impedance .
> added 01-26: Tascam TH02 and AKG K550 measurements in headphones|measurements.
up to date 01-24: Foobar for dummies tutorial.
up to date 01-19: Koss KSC75 measurements with Kramer mod in headphones|measurements .
> added 01-18: Yello album opinions in music|album reviews part.
> added 01-15: Koss PortaPro measurements within the headphones|measurements part.
> added 01-12: Some data on the snubbering of diodes in rectifiers.
up to date 01-03: the headphones|recommended ones part.

——————– 2014 ————————
——————– 2013 ————————

beneath: date format MM-DD

up to date 12-22: Modified the format of the headphones|measurements part.
up to date 12-17: How a lot energy do you want ? solutions in:  learn|power, impedance.
> added 12-11: How a lot energy do you want ? solutions in:  learn|power, impedance.
> added 12-08: AKG K551 modification article within the schematics|headphone part.
> added 12-05: AKG K551 and Beyerdynamic T50P measurements in headphones|measurements
up to date 11-24: Superlux HD681-EVO article within the schematics|headphone part.
> added 11-14: Superlux HD681 substitute pad measurements in schematics|headphone
up to date 11-06: Added some headphones to the filter PCB article.
up to date 10-30: Some headphone cable measurements within the cable part.
> added 10-23: Teufel Aureol® Actual within the headphones|measurements part.
up to date 09-25: Superlux HD681-EVO newer model within the schematics|headphone part.
> added 09-18: SFI drivers DIY headphone within the headphones|measurements part.
> added 09-07: Superlux HD681-EVO modifications within the schematics|headphone part.
up to date 08-30: Power amp adapter circuit added.
up to date 08-25: Power supply article with additional information to restore SMPS
> added 08-21: Superlux HD681-EVO within the headphones|measurements part.
up to date 08-15: Power supply article with additional information on mains transformers
up to date 08-12: Power supply article with additional information on mains filters
> added 07-17: Plots of DT990-600 and KSC75  in headphones|measurements
> added 07-15: Some details about mains filters within the power supplies section
up to date 07-14: modified the location navigation barely.
up to date 07-12: Jays V-Jays within the headphones|measurements part.
> added 07-11Silverscrest KH-2347 plots within the headphones|measurements part.
> added 07-02: HD25-1 / HD 320 / HD215, Philips SHP-9000 in headphones|measurements
> added 06-27: Sony MDR-XB500 plots within the headphones|measurements part
up to date 06-30: Power supply article with further drawings and data
> added 06-25: Classic Stax SR-5 with SRD-6headphones|measurements
up to date 06-23: Headphones part and added some footage
> added 06-18: Details about amplifiers and the way they work
up to date 06-09: HD681 plots within the headphones|measurements part
> added 06-08: Easy rechargeable battery monitoring circuit schematic
> added 06-02: Overview of Handel’s Messiah
> added 05-31: Overview of Deep Purple’s album ‘Now What
> added 05-26: Anecdotal a couple of cable swap
> added 05-25: a hyperlink to an unimaginable quantity of audio related online calculators and explanations
> added 05-23:Some data on completely different headphone driver types.
> added 05-18: Technical data about Project Starlight & Ember
> added 05-15: the HD681 revisited a brand new article in regards to the filter and extra background data
up to date 05-12: the Headphone Correction Filter guide
> added 05-11: evaluate of the band TinyFish in Rock/Pop reviews
> added 05-07: Overview of Sennheiser RS160 – wi-fi headphones by Jeff.
> added 05-07: schematics of two new hybrid amplifiers.
> added 05-07: Some findings about DIY headphone measurement rigs.
up to date 05-02: the Headphone Correction Filter guide and T40RP-mkII / T50RP manuals.
> added 04-28: details about the Headphone Correction Filter circuit.
> added 04-14: evaluate of the O2 headphone amplifier
up to date 04-13: The new filter PCB a sneak preview
up to date 04-10: Power supply article
> added 04-09: Measurements of some headphones.
> added 04-05: a part of the article on the utilization of speaker amplifiers for driving headphones.
> added 04-03: Web page with all headphone reviews on one web page.
> added 04-02: headphone reviews
up to date 03-31: Power supply article
> added 03-31: article about crossfeed.
> added 03-30: we added a FORUM along with the remark replies.
up to date 03-29: Rock & Pop album reviews
> added 03-28: Some details about rectifiers in energy provides
2013-03-08: Web site was created

——————– 2013 ————————

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