JaZZ
Headphoneus Supremus
I will add a few more frequency-response graphs published some time ago in the German magazine «Stereoplay» (1/07).
As expressed in several post, they match my own sonic impressions better than the HeadRoom graphs (which show a uniform «distortion» throughout the product palette).


Note that the frequency range reaches from 10 Hz to 40 kHz -- so the first column represents infrasound (10-20 Hz), the two last columns represent ultrasound (20-40 kHz).
The lower curves show the degree of harmonic distortion.
The lines dividing the vertical coordinate have a distance of ~5.7 dB (unfortunately the value numbers in the printed graphs are not accurately allocated to them).
.
As expressed in several post, they match my own sonic impressions better than the HeadRoom graphs (which show a uniform «distortion» throughout the product palette).
Note that the frequency range reaches from 10 Hz to 40 kHz -- so the first column represents infrasound (10-20 Hz), the two last columns represent ultrasound (20-40 kHz).
The lower curves show the degree of harmonic distortion.
The lines dividing the vertical coordinate have a distance of ~5.7 dB (unfortunately the value numbers in the printed graphs are not accurately allocated to them).
.