Fundamentally, there is nothing in the sound of a headphone other than specific spectral response (for a given head fit and ear). If you have an "ideal" headpho

Fundamentally, there is nothing in the sound of a headphone other than specific spectral response (for a given head fit and ear). If you have an "ideal" headphone, you can emulate any headphone which is less than ideal. If well-recorded music sounds bad on an ideal headphone, the recording is set up for a non-ideal headphone. You'll notice in those response curves, there are common characteristics in the response of almost all the headphones they tested, within a fairly small margin (considering). Maybe for a mastering technician, the right thing to do is master for the average suboptimal headphone, and not for a linear response listening instrument; but that doesn't mean a headphone closer to the ideal is wrong, it just means that you need to filter audio that wasn't intended for its response profile.