Latest
 24 November 2020Added: a Glossary. Going forward, I'll add more entries and illustrations.
 8 November 2020B&W PX5 added to the test results.
 30 October 2020Reinstated: AKG K371, with corrected measurement results (explanation here).
 29 October 2020Reinstated: Audeze LCD-1, with corrected measurement results (explanation here).
 28 October 2020B&W PX7 added to the test results.
 27 October 2020HEDD Audio HEDDphone added to the test results.
 26 October 2020On 14 May I promised you a complete, unexpurgated explanation of why I had to pull six headphones from the HTL listing because of uncertainties about their frequency response measurements. Well, it has taken this long to identify the problem and fix it, because it proved to be something of a surprise. You can read the full story here.
 26 August 2020Oppo PM-3 added to the test results. Full commentary will be added soon.
 26 August 2020Oppo PM-1 added to the test results. Full commentary will be added soon.
 26 August 2020Oppo PM-2 added to the test results. Full commentary will be added soon.
 24 July 2020Shure KSE1200 added to the test results. Full commentary will be added soon.
 24 July 2020Photos added to PSB M4U 8 test.
 1 July 2020AKG N5005 added to the test results. Full commentary will be added soon.
 27 June 2020HIFIMAN RE-600S added to the test results. Full commentary will be added soon.
 27 June 2020Meze RAI Solo added to the test results. Full commentary will be added soon.
 26 June 2020Test Results menu expanded to include separate listings of in-ear and over-ear models.
 26 June 2020Meze RAI Penta added to the test results. Full commentary will be added soon.
 26 June 2020Etymotic ER-4S added to the test results. Full commentary will be added soon.
 24 June 2020All Harman PPR scores are now also expressed as percentage figures, to allow for comparison across different headphone types. See this page for further explanation.
 11 June 2020A Help Videos page has been added to assist with making the most of HTL's test results.
 7 June 2020Audio-Technica ATH-W1000Z added to test results. Full commentary will be added soon.
 6 June 2020A small landmark: 50 headphone measurements now on HTL. Watch this space...
 6 June 2020Audeara A-01 added to test results. Full commentary will be added soon.
 6 June 2020ADL H128 added to test results. Full commentary will be added soon.
 6 June 2020Denon AH-D5200 added to test results. Full commentary will be added soon.
 5 June 2020Panasonic RP-HD10 added to test results. Full commentary will be added soon.
 5 June 2020Sonoma Model One added to test results. Full commentary will be added soon.
 4 June 2020Phonon SMB-02 added to test results. Full commentary will be added soon.
 4 June 2020Technics EAH-T700 added to test results. Full commentary will be added soon.
 4 June 2020Dekoni Blue added to test results. Full commentary will be added soon.
 3 June 2020Blue Ella added to test results. Full commentary will be added soon.
 3 June 2020Final Sonorous X added to test results. Full commentary will be added soon.
 3 June 2020Fostex TH900 added to test results. Full commentary will be added soon.
 2 June 2020Fostex TH610 added to test results. Full commentary will be added soon.
 1 June 2020Headband resonance test added to the Self-test page.
 1 June 2020Lateralisation test added to the Self-test page.
 29 May 2020Self-test page added, which provides test signals to assist independent assessment.
 28 May 2020A note about USB-C headphones has been added to Words > Additional content
 26 May 2020Audio-Technica ATH-A2000Z added to test results. Full commentary will be added soon.
 26 May 2020PSB M4U 2 added to test results. Full commentary will be added soon.
 25 May 2020B&W PX added to test results. Full commentary will be added soon.
 25 May 2020B&W P9 Signature added to test results. Full commentary will be added soon.
 24 May 2020KEF M500 added to test results. Full commentary will be added soon.
 24 May 2020Grado GS2000e added to test results. Full commentary will be added soon.
 24 May 2020Audio-Technica ATH-ADX5000 added to test results. Full commentary coming soon.
 21 May 2020Klipsch HP-3 added to test results. Full commentary will be added soon.
 21 May 2020AKG N90Q added to test results. Full commentary will be added soon.
 21 May 2020AKG K812 added to test results. Full commentary will be added soon.
 20 May 2020Beyerdynamic T1 gen2 added to test results. Full commentary will be added soon.
 20 May 2020Beyerdynamic T1 added to test results. Full commentary will be added soon.
 19 May 2020Beyerdynamic Amiron Home added to test results. Full commentary will be added soon.
 19 May 2020Audeze LCD-X added to test results. Full commentary will be added soon.
 19 May 2020Audeze LCD-3 added to test results. Full commentary will be added soon.
 18 May 2020Zoom control buttons (in/out/reset pan and zoom) have been added to the test results graphics.
 18 May 2020Incorrect title for Meze 99 Classics impedance graph fixed. Thanks for alerting me, Andy.
 17 May 2020Audeze LCD-2 added to test results. Full commentary will be added soon.
 17 May 2020Pioneer SE-Master1 added to test results. Full commentary will be added soon.
 17 May 2020Sonus faber Pryma 0|1 added to test results. Full commentary will be added soon.
 17 May 2020AudioQuest NightOwl added to test results. Full commentary will be added soon.
 16 May 2020AudioQuest NightHawk added to test results. Full commentary will be added soon.
 16 May 2020Focal Spirit Professional added to test results. Full commentary will be added soon.
 15 May 2020Focal Utopia added to test results. Full commentary will be added soon.
 15 May 2020Focal Elear added to test results. Full commentary will be added soon.
 15 May 2020Further to the item below, additional checks have ascertained that all the measurements conducted up to end-September 2019 are reliable. As two further headphones were measured subsequent to this date - the Mysphere 3.2 and Abyss AB-1266 Phi TC - their test results have also now been removed from HTL, I hope temporarily.
 14 May 2020It has been brought to my attention today, by someone who uses similar test equipment to mine, that our response measurements, which used to align well, diverged beginning earlier this year. In the circumstances, the only responsible action is for me to have the ear simulator in my artificial ear recalibrated, and remove from HTL those tests (while this issue is addressed) which may have been affected: AKG K371, Audeze LCD-1, Audio-Technica ATH-AWKT Kokutan, Dan Clark Audio Aeon 2 Open and T+A Solitaire P. I apologise for this thorougly undesirable situation. When the issue is resolved, I will provide a clear explanation of what the issue was. And, if necessary and I am able to, I will post new measurements for all the headphones affected.
 14 May 2020Meze 99 Classics added to test results. Full commentary will be added soon.
 14 May 2020Focal Clear added to test results. Full commentary will be added soon.
 12 May 2020Reset zoom in the graph windows is now reset pan and zoom.
 12 May 2020HTL now has a Facebook page. Content will be added soon.
 12 May 2020Reset zoom control added to graph windows (not with mobile devices). Note that panning is not reset.
 12 May 2020Web browsers FAQ updated regarding some quirks when HTL is viewed using Firefox.
 12 May 2020Android web browser graph display issue fixed.
 11 May 2020HTL goes live.