Band: opinion spread · Dot: weighted average
Sources split on how the same measured lift sounds. Every rig shows the 4–5 kHz region 1.4–5 dB above the HD 600 on the same fixture. Just over half the sources — Crinacle, Resolve, RTINGS, Sonarworks, Headphonesty, listener and a long tail of owners — hear it as intense, sharp, sibilant or fatiguing, especially on poorly mastered tracks or in shooters. Nearly as many — ASR, DIY-Audio-Heaven, Headfonia, What Hi-Fi?, Tom's Guide, DMS — call it bright but benign and never sibilant. One reviewer heard the opposite problem: too little air above 7 kHz. The split tracks the listener's sensitivity, the recording, how the clamp and pads seal, and to a small degree the unit.
Measured
Normalised at 500 Hz, the 4–5 kHz band sits +1.4 to +5.0 dB above each rig's own HD 600 on all eleven rigs that hold both (oratory1990 +2.0, RTINGS' B&K 5128 +5.0, Super* Review +3.5, boizoff's 2025 sample +4.0 to +4.9, Unheard Lab's post-2022 unit +3.8). Against the rigs' Harman targets the excess peaks at ~4.3–4.4 kHz on five of seven AutoEq rigs (+2.1 to +4.6 dB); Super* Review and a worn-pad unit peak at ~8.5 kHz instead. Resolve found the 8 kHz peak moves with clamp pressure on the fixture. DIY-Audio-Heaven measures about 2 dB less treble on post-2022 units, but second samples on three rigs differ from the first by −2.7 to +1.8 dB in the same band.
vs. listeners — The camps aren't disputing the fact — 'harsh' and 'bright but fine' are opposite verdicts on the same 4–5 kHz lift that every rig shows. How hard it lands moves with seal and clamp (Resolve), pad wear, the recording, and listener sensitivity. The small revision and unit spread probably explain only part of the split.
“its 5k-ishHz boost gets a little intense and harsh at times”
Crinacle, In-Ear Fidelity
“Yes, they are a bit bright but not annoyingly so at all.”
amirm, Audio Science Review
“it is a little rough, and does not have enough presence beyond 7khz”
Blinxat, Head-Fi showcase review (2.5/5)
