Band: opinion spread · Dot: weighted average
Sources split on how much the shape matters, not on the shape itself. A slight majority — most editorial reviewers and many owners — hear a likeable, near-neutral or gently V-shaped studio tuning that is easy to live with and easy to correct. The other camp, which includes every source that measured it closely and the lab that scored it lowest, hears a bassy, scooped, sharp tuning that is not a neutral reference without EQ. Both camps agree it takes EQ well.
Measured
Four rigs agree on the curve. On Earphones Archive's B&K 5128 the velour-pad measurement sits about 8 dB above the rig's diffuse-field target from 30 to 100 Hz, about 6 dB below it at 200 Hz and 7 dB below it at 3 kHz, with a notch near 7 kHz and an 8 kHz peak about 5.6 dB above target. GadgetryTech's pinna-clone rig shows the same shape against its HD 6XX: +6.5 dB at 50 Hz, −4 to −6 dB at 200–250 Hz, −6.6 dB at 3 kHz and +6.5 dB at 8 kHz. DIY-Audio-Heaven also found the balance shifting substantially on sources above about 10 Ω output impedance, getting boomier as it rises.
vs. listeners — The graphs don't disagree; the verdicts do. 'Near-neutral' and 'not neutral' describe the same curve against different reference points — a listener's idea of a lively closed-back versus a flat mixing reference. Source output impedance is a second, physical reason two listeners can hear different balances.
“there’s something very likeable about the sound of both models just as they are”
Sound On Sound (Sam Inglis)
“An overall rather expensive but nicely made, sturdy and sensitive (not very closed) studio headphone with a bassy sound with a sharp sound that is easy to drive but output resistance dependent.”
DIY-Audio-Heaven (solderdude)
