| 24 January 2021 | Shure Aonic 50 added to the test results |
| 4 January 2021 | Sennheiser HD 820 added to the test results. |
| 24 November 2020 | Full test of the Sennheiser HD 800 S added to the test results. The legacy test remains for purposes of comparison. |
| 24 November 2020 | Added: a Glossary. Going forward, I'll add more entries and illustrations. |
| 8 November 2020 | B&W PX5 added to the test results. |
| 30 October 2020 | Reinstated: AKG K371, with corrected measurement results (explanation here). |
| 29 October 2020 | Reinstated: Audeze LCD-1, with corrected measurement results (explanation here). |
| 28 October 2020 | B&W PX7 added to the test results. |
| 27 October 2020 | HEDD Audio HEDDphone added to the test results. |
| 26 October 2020 | On 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 2020 | Oppo PM-3 added to the test results. Full commentary will be added soon. |
| 26 August 2020 | Oppo PM-1 added to the test results. Full commentary will be added soon. |
| 26 August 2020 | Oppo PM-2 added to the test results. Full commentary will be added soon. |
| 24 July 2020 | Shure KSE1200 added to the test results. Full commentary will be added soon. |
| 24 July 2020 | Photos added to PSB M4U 8 test. |
| 1 July 2020 | AKG N5005 added to the test results. Full commentary will be added soon. |
| 27 June 2020 | HIFIMAN RE-600S added to the test results. Full commentary will be added soon. |
| 27 June 2020 | Meze RAI Solo added to the test results. Full commentary will be added soon. |
| 26 June 2020 | Test Results menu expanded to include separate listings of in-ear and over-ear models. |
| 26 June 2020 | Meze RAI Penta added to the test results. Full commentary will be added soon. |
| 26 June 2020 | Etymotic ER-4S added to the test results. Full commentary will be added soon. |
| 24 June 2020 | All 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 2020 | A Help Videos page has been added to assist with making the most of HTL's test results. |
| 7 June 2020 | Audio-Technica ATH-W1000Z added to test results. Full commentary will be added soon. |
| 6 June 2020 | A small landmark: 50 headphone measurements now on HTL. Watch this space... |
| 6 June 2020 | Audeara A-01 added to test results. Full commentary will be added soon. |
| 6 June 2020 | ADL H128 added to test results. Full commentary will be added soon. |
| 6 June 2020 | Denon AH-D5200 added to test results. Full commentary will be added soon. |
| 5 June 2020 | Panasonic RP-HD10 added to test results. Full commentary will be added soon. |
| 5 June 2020 | Sonoma Model One added to test results. Full commentary will be added soon. |
| 4 June 2020 | Phonon SMB-02 added to test results. Full commentary will be added soon. |
| 4 June 2020 | Technics EAH-T700 added to test results. Full commentary will be added soon. |
| 4 June 2020 | Dekoni Blue added to test results. Full commentary will be added soon. |
| 3 June 2020 | Blue Ella added to test results. Full commentary will be added soon. |
| 3 June 2020 | Final Sonorous X added to test results. Full commentary will be added soon. |
| 3 June 2020 | Fostex TH900 added to test results. Full commentary will be added soon. |
| 2 June 2020 | Fostex TH610 added to test results. Full commentary will be added soon. |
| 1 June 2020 | Headband resonance test added to the Self-test page. |
| 1 June 2020 | Lateralisation test added to the Self-test page. |
| 29 May 2020 | Self-test page added, which provides test signals to assist independent assessment. |
| 28 May 2020 | A note about USB-C headphones has been added to Words > Additional content |
| 26 May 2020 | Audio-Technica ATH-A2000Z added to test results. Full commentary will be added soon. |
| 26 May 2020 | PSB M4U 2 added to test results. Full commentary will be added soon. |
| 25 May 2020 | B&W PX added to test results. Full commentary will be added soon. |
| 25 May 2020 | B&W P9 Signature added to test results. Full commentary will be added soon. |
| 24 May 2020 | KEF M500 added to test results. Full commentary will be added soon. |
| 24 May 2020 | Grado GS2000e added to test results. Full commentary will be added soon. |
| 24 May 2020 | Audio-Technica ATH-ADX5000 added to test results. Full commentary coming soon. |
| 21 May 2020 | Klipsch HP-3 added to test results. Full commentary will be added soon. |
| 21 May 2020 | AKG N90Q added to test results. Full commentary will be added soon. |
| 21 May 2020 | AKG K812 added to test results. Full commentary will be added soon. |
| 20 May 2020 | Beyerdynamic T1 gen2 added to test results. Full commentary will be added soon. |
| 20 May 2020 | Beyerdynamic T1 added to test results. Full commentary will be added soon. |
| 19 May 2020 | Beyerdynamic Amiron Home added to test results. Full commentary will be added soon. |
| 19 May 2020 | Audeze LCD-X added to test results. Full commentary will be added soon. |
| 19 May 2020 | Audeze LCD-3 added to test results. Full commentary will be added soon. |
| 18 May 2020 | Zoom control buttons (in/out/reset pan and zoom) have been added to the test results graphics. |
| 18 May 2020 | Incorrect title for Meze 99 Classics impedance graph fixed. Thanks for alerting me, Andy. |
| 17 May 2020 | Audeze LCD-2 added to test results. Full commentary will be added soon. |
| 17 May 2020 | Pioneer SE-Master1 added to test results. Full commentary will be added soon. |
| 17 May 2020 | Sonus faber Pryma 0|1 added to test results. Full commentary will be added soon. |
| 17 May 2020 | AudioQuest NightOwl added to test results. Full commentary will be added soon. |
| 16 May 2020 | AudioQuest NightHawk added to test results. Full commentary will be added soon. |
| 16 May 2020 | Focal Spirit Professional added to test results. Full commentary will be added soon. |
| 15 May 2020 | Focal Utopia added to test results. Full commentary will be added soon. |
| 15 May 2020 | Focal Elear added to test results. Full commentary will be added soon. |
| 15 May 2020 | Further 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 2020 | It 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 2020 | Meze 99 Classics added to test results. Full commentary will be added soon. |
| 14 May 2020 | Focal Clear added to test results. Full commentary will be added soon. |
| 12 May 2020 | Reset zoom in the graph windows is now reset pan and zoom. |
| 12 May 2020 | HTL now has a Facebook page. Content will be added soon. |
| 12 May 2020 | Reset zoom control added to graph windows (not with mobile devices). Note that panning is not reset. |
| 12 May 2020 | Web browsers FAQ updated regarding some quirks when HTL is viewed using Firefox. |
| 12 May 2020 | Android web browser graph display issue fixed. |
| 11 May 2020 | HTL goes live. |