It's part of the intentional tuning of these cans to make em fun-sounding. Unfortunately the colouration is a bit too much for those who are sensitive to sibilance. The easiest way to "EQ fix" it is to use parametric EQ and put in a sharp notch centered around 12kHz or so that extends from 9kHz to 16kHz.
Is there any sort of modding trick to help dampen them?
Edited by Thujone - 5/15/13 at 6:05pm