For remarks, discussions, questions, about this website or to contact us please visit our FORUM.

When new information is added it will be shown below in the ‘whats new‘ section below.

What’s new ?

updated 08-08: AKG K702 K712 & K7XX measurements .

> added 08-01: AKG K712 measurements and evaluation.

> added 07-26: Beyerdynamic DT 880-600 measurements and evaluation.

> added 06-27: Shure SRH-1440 measurements and evaluation

> added 06-24: Shure SRH-840 measurements and evaluation

updated 06-14: DT880 Black SE and HD800 pages, added new info

> added 06-07: Beyerdynamic DT 880 Black SE measurements, modifications

> added 04-30: AKG K361 measurements and evaluation.

> added 04-19: AKG K371 measurements and evaluation.

> added 03-25: Roland RH-5 measurements and evaluation.

> added 02-03: AKG K702 measurements, evaluation and treble ‘fix’

updated 02-02: measurements added of a ‘veiled’ HD650 (not a myth)

> added 01-22: Shure SRH-1840 measurements and evaluation.

> added 01-19: Shure SRH-1540 measurements and evaluation.

————————-2020—————————–

> added 11-14: Philips Fidelio X2HR measurements and evaluation.

> added 10-11: audio-technica ATH-MSR7 measurements and evaluation.

> added 10-10: Yamaha HPH-MT220 measurements and evaluation.

> added 09-15: more passive filters

> added 08-30: AKG K812 measurements, evaluation.

updated 08-17: Beyerdynamic DT1770 measurements, evaluation and modification

updated 08-11: Beyerdynamic DT1990 measurements, evaluation and modification

> added 07-13: vintage Sennheiser HD420 SL restoration and evaluation

> added 07-11: Sennheiser HD 4.40 BT measurements and evaluation

> added 06-16: 1MORE Triple Driver Over-Ear measurements and evaluation

updated 06-16: NAD VISO HP50 added passive filter schematic

updated 06-15: measurements of recent Romanian produced HD58X

> added 05-19: Grundig EE1178 (BlueTooth) measurements and evaluation

> added 05-19: Denon AH-GC20 (B.T. / N.C.) measurements and evaluation

> added 05-15: Bose QC35-II (B.T. / N.C.) measurements and evaluation

> added 04-03: HIFIMAN HE35X measurements and evaluation

> added 03-31: AKG K701 measurements and evaluation

> added 03-10: Sony WH-1000X-M3 (B.T. / N.C.) measurements and evaluation

> added 03-09: Sony WH-CH700N (B.T. / N.C.) measurements and evaluation

> added 01-24: HIFIMAN Edition XX measurements, evaluation, modification

> added 01-12: AKG K7XX ( Mass drop) measurements and evaluation

updated 01-02: Superlux HD681 measurements

————————-2019—————————–

updated 12-27: Massdrop HD58X modifications article

> added 12-08: Marshall Major II Bluetooth measurements and evaluation

updated 11-18: Some additional info on Koss KSC75 earphones

> added 10-21: A for sale section where some reviewed gear is up for sale

> added 10-17: Beyerdynamic T51p measurements and evaluation

updated 10-07: Beyerdynamic Custom One Pro with COP–Plus measurements.

> added 09-29: NAD VISO HP50 measurements and evaluation

> added 08-26: Beyerdynamic Custom One Pro measurements, evaluation and modifications

> added 08-25: Pioneer SE-305 measurements and evaluation

> added 08-19: Campfire Audio Cascade measurements and evaluation

> added 08-18: Audeze LCD-4z measurements and evaluation

> added 08-17: Sennheiser HD820 measurements and evaluation

> added 08-13: Powerbank output keep-alive circuit for powering low current devices

> added 07-02: MrSpeakers Ether measurements and evaluation

> added 07-01: Superlux HD687 measurements, mods and evaluation

updated 07-01: Sennheiser HD58X Jubilee added some plots

> added 06-27: AKG K92 measurements and evaluation

> added 06-26: Beyerdynamic Amiron Wireless measurements

> added 06-25: Sennheiser HD599 measurements

updated 06-25: Sennheiser HD58X Jubilee measurements and evaluation

> 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 evaluation

> added 06-21: HIFIMAN Ananda measurements and evaluation

> added 06-08: Mitchell & Johnson JP1 DJ measurements

> added 05-26: Beyerdynamic DT 880 Edition treble modification

updated 05-20: 3rd-party-plots useful links to other measurement sites

updated 04-24: Beyerdynamic DT 880 Edition (250Ω) measurements

updated 04-07: Kameleon filter list.

> added 04-01: Superlux HD671 measurements and evaluation

updated 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 evaluation

> added 02-10: Takstar PRO 82 monitor measurements and evaluation

updated 01-21: Superlux HD688 production version measurements



————————-2018—————————–

updated 12-26: pdf with more 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

updated 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.

updated 10-08: Denon AH-D600 modifications measurements.

updated 09-21: Sennheiser HD250 linear II measurements.

updated 09-19: AKG K501 measurements with some experiments.

> added 09-08: AKG K501 measurements.

> added 09-06: HIFIMAN HE-6 (early 4-screw version) measurements.

> added 08-10: Creative Sound BlasterX H7 Tournament measurements.

> added 07-20: HIFIMAN HE1000 measurements

> added 07-19: HIFIMAN Edition S and Edition X measurements

> added 07-18: HIFIMAN HE400S and HE-560 measurements

updated 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.

updated 07-01: Foobar Tutorials

updated 06-23: Cables article

> added 06-17: Balanced attenuators in attenuator and power-amp sections.

updated 06-04: Foobar tutorial part 2

> added 06-03: Battery circuit change for Kameleon and Kameleon 2 portable amps.

updated 06-01: supported Kameleon modules list

updated 04-17: more Roland RH-300 measurements.

> added 04-08: Roland RH-300 measurements.

updated 03-18: changed the how to interpret graphs tree-structure

updated 03-12: added info to the how to interpret graphs article

> added 03-08: t.bone HD 990 D headphone in measurements

updated 03-03: supported Kameleon modules list

> added 03-01: Superlux HD687 (prototype) measurements

updated 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

updated 01-09: Kameleon-2 Desktop and Portable amp build manuals

updated 01-02: Headphone attenuator adapter article

————————-2017—————————–

updated 12-31: Foobar tutorials

updated 12-08: ATH-MSR7 turned out to be fake, moved to crap section

> added 11-26: Dedicated Kameleon page

updated 11-16: HiFiman HE-350 measurements

updated 10-29: supported headphone list for Kameleon

updated 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

updated 10-12: Re-arranged the measurements section

> added 10-08: fix for HiFiman HE-350 treble in measurements|HIFIMAN

> added 10-08: HiFiman HE-350 measurements in measurements|HIFIMAN

updated 10-03: Kameleon articles (more 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 manual

updated 09-04: Kameleon-2 desktop and portable amp manuals

> added 08-24: My views on ‘neutral sound‘ in learn

> added 08-06: Influence of Fletcher-Munson on listening pleasure in learn

> added 07-28: Taming the treble article in headphones|taming the treble

updated 07-27: How to interpret graphs, added inner|fidelity compensation.

> added 06-19: Philips SHB-9850NC measurements in measurements|Philips

updated 06-01: headphone power table in learn|articles

> added 06-01: Beyerdynamic DT150 measurements in measurements|Beyerdynamic

updated 05-26: Headphone adapter article in learn|Power-amp-adapter

updated 05-21: Superlux HD662-EVO measurements in measurements|Superlux

updated 05-14: info about SMPS vs LPS power supplies in learn|power supply types

>added 05-04: Ausdom ANC7 measurements in measurements|Ausdom

>added 04-15: Schematic G1217 project Ember rev. 2.1 in schematics|amplifier

updated 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

updated 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 Wireless measurements in measurements|Beats

updated 01-24: Ausdom M05 measurements in measurements|Ausdom

> added 01-08: Sennheiser HD700 passive filter in schematics|headphone related

———————— 2016 ————————

updated 12-24: Some headphone measurements have been updated.

> 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.

updated 12-13: Philips cityscape uptown in measurements|Philips

updated 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 models in schematics|headphone

> added 11-18: Sennheiser HD800 measurements in measurements|Sennheiser

> added 11-13: Foobar tutorial part 3 SACD plugin in digital|software

updated 11-12: Yet some more measurements in Sennheiser HD650 modifications.

updated 11-02: Foobar tutorial about playing DSD in digital|PC software.

> added 11-01: created a download section with articles/schematics etc.

updated 10-18: Even more measurements on Sennheiser HD650 modifications.

updated 10-15: Foobar 2000 for dummies in digital|PC software.

updated 09-17: added info about square-waves in explanations|how to interpret graphs

updated 09-17: Information about listening levels in learn|power etc.

> added 09-13: Extensive 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

updated 08-13: Olive-Welti target curve in explanations|how to interpret graphs

updated 08-11: Headphone correction filter article

> added 06-29: Info about headphone attenuators for IEM’s and sensitive headphones.

updated 06-17: information about power supplies in learn|power supplies

updated 05-23: Headphone correction filter manual in schematics|headphone

> added 05-02: Schematics for the ‘SeNNator‘ amplifier in schematics|amplifier

updated 05-07: Kameleon article in schematics|headphone

> added 05-02: Measurements of Sennheiser HD600 and Ultrasone HFI-780

> added 04-23: Schematics for the latest versions of several G1217 amps.

updated 04-19: Philips uptown article (added info about securing the pads)

updated 04-12: Added some info on tubes in amplifiers|hybrid

updated 03-21: Kameleon and filter article in schematics|headphone

> added 03-08: A detailed 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

updated 02-07: FiiO and Sansa measurements in Digital|Digital Audio Players

> added 02-06: Schematic of project Solstice in schematics|amplifier

updated 02-04: Added plots from Kameleon amp in schematics|headphone

updated 02-02: Philips SHL9505-GY plots in headphones|measurements

> added 01-28: Info about HD650 pads in headphones|measurements

updated 01-26: Info on rectifiers in learn|power supply/filters

> added 01-21: ARTA setup guide by BMF in learn|articles

> added 01-20: my views on ‘burn-in‘ in learn|burn-in

updated 01-11: the headphones|recommended ones section.

———————— 2015 ————————

updated 12-28: The AKG K518-DJ in headphone|measurements

> added 12-24: Philips Cityscape Uptown SHL9505 in headphones|measurements

updated 12-24: changed the layout of headphones|measurements

> added 12-16: Schematic of a tube buffer circuit in Schematics|Amplifier

> added 11-16: Some info about measurements and disclaimer in headphones|measurements

> added 11-13: Article about dB: do deciBells ring a bell ? in learn|do decibells

updated 10-04: Philips A5 Pro with PCU110 velours pads measurements in headphones|measurements

> added 10-01: Philips A5 Pro measurements in headphones|measurements

updated 09-10: Kameleon article (added Sennheiser Momentum)

> added 09-04: Some extra info about getting a good ‘seal’ of headphones in 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

updated 08-10: Some info added in schematics|amplifier section

updated 08-09: headphone power table

> added 07-13: AKG K181 / K400 / K500 & Beyerdynamic DT250-250 in headphones|measurements

> added 07-09: Superlux HD-685 evaluation 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

updated 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

updated 05-22: Headphone correction filter article in Schematics|Headphone

updated 05-19: headphones|recommended ones page.

updated 05-14: added headphone(s) to the Kameleon article in schematics|amplifier.

updated 05-14: Kameleon article and headphone power table

> added 04-28: Kameleon portable headphone amplifier article in schematics|amplifier

> added 04-19: Some information about regulators in Explanations|power supplies.

updated 04-09: Tascam TH-02 mods in headphones|measurements

> added 03-19: An section about efficiency in Explanations|power, impedance.

updated 03-18: The Explanations|how to interpret graphs section with Olive-Welti curve.

> added 03-17: Beyerdynamic T90 passive highs/peak filter in schematics|headphone.

> added 03-16: How LOUD we listen, what power we need for it ? Explanations|power, impedance.

updated 02-17: Beyerdynamic T50P/DT1350 pad measurements in headphones|measurements

> added 02-10: added Sunrise-III and Horizon-III in schematics|amplifier

updated 02-02: updated version of the impedance/resistance article in learn|power, impedance .

> added 01-26: Tascam TH02 and AKG K550 measurements in headphones|measurements.

updated 01-24: Foobar for dummies tutorial.

updated 01-19: Koss KSC75 measurements with Kramer mod in headphones|measurements .

> added 01-18: Yello album reviews in music|album reviews section.

> added 01-15: Koss PortaPro measurements in the headphones|measurements section.

> added 01-12: Some information on the snubbering of diodes in rectifiers.

updated 01-03: the headphones|recommended ones section.

———————— 2014 ————————

updated 12-22: Changed the layout of the headphones|measurements section.

updated 12-17: How much power do you need ? answers in: learn|power, impedance.

> added 12-11: How much power do you need ? answers in: learn|power, impedance.

> added 12-08: AKG K551 modification article in the schematics|headphone section.

> added 12-05: AKG K551 and Beyerdynamic T50P measurements in headphones|measurements

updated 11-24: Superlux HD681-EVO article in the schematics|headphone section.

> added 11-14: Superlux HD681 replacement pad measurements in schematics|headphone

updated 11-06: Added some headphones to the filter PCB article.

updated 10-30: Some headphone cable measurements in the cable section.

> added 10-23: Teufel Aureol® Real in the headphones|measurements section.

updated 09-25: Superlux HD681-EVO newer version in the schematics|headphone section.

> added 09-18: SFI drivers DIY headphone in the headphones|measurements section.

> added 09-07: Superlux HD681-EVO modifications in the schematics|headphone section.

updated 08-30: Power amp adapter circuit added.

updated 08-25: Power supply article with additional info to repair SMPS

> added 08-21: Superlux HD681-EVO in the headphones|measurements section.

updated 08-15: Power supply article with additional info on mains transformers

updated 08-12: Power supply article with additional info on mains filters

> added 07-17: Plots of DT990-600 and KSC75 in headphones|measurements

> added 07-15: Some information about mains filters in the power supplies section

updated 07-14: changed the site navigation slightly.

updated 07-12: Jays V-Jays in the headphones|measurements section.

> added 07-11: Silverscrest KH-2347 plots in the headphones|measurements section.

> added 07-02: HD25-1 / HD 320 / HD215, Philips SHP-9000 in headphones|measurements

> added 06-27: Sony MDR-XB500 plots in the headphones|measurements section

updated 06-30: Power supply article with additional drawings and info

> added 06-25: Vintage Stax SR-5 with SRD-6headphones|measurements

updated 06-23: Headphones section and added some pictures

> added 06-18: Information about amplifiers and how they work

updated 06-09: HD681 plots in the headphones|measurements section

> added 06-08: Simple rechargeable battery monitoring circuit schematic

> added 06-02: Review of Handel’s Messiah

> added 05-31: Review of Deep Purple’s album ‘Now What‘

> added 05-26: Anecdotal about a cable swap

> added 05-25: a link to an incredible amount of audio related online calculators and explanations

> added 05-23:Some information on different headphone driver types.

> added 05-18: Technical info about Project Starlight & Ember

> added 05-15: the HD681 revisited a new article about the filter and more background info

updated 05-12: the Headphone Correction Filter manual

> added 05-11: review of the band TinyFish in Rock/Pop reviews

> added 05-07: Review of Sennheiser RS160 – wireless headphones by Jeff.

> added 05-07: schematics of 2 new hybrid amplifiers.

> added 05-07: Some findings about DIY headphone measurement rigs.

updated 05-02: the Headphone Correction Filter manual and T40RP-mkII / T50RP manuals.

> added 04-28: information about the NEW Headphone Correction Filter circuit.

> added 04-14: review of the O2 headphone amplifier

updated 04-13: The new filter PCB a sneak preview

updated 04-10: Power supply article

> added 04-09: Measurements of a few headphones.

> added 04-05: part of the article on the usage of speaker amplifiers for driving headphones.

> added 04-03: Page with all headphone reviews on one page.

> added 04-02: headphone reviews

updated 03-31: Power supply article

> added 03-31: article about crossfeed.

> added 03-30: we added a FORUM in addition to the comment replies.

updated 03-29: Rock & Pop album reviews

> added 03-28: Some information about rectifiers in power supplies

> 2013-03-08: Website was created

———————— 2013————————