Describe the sound of the distortion. Is it like static?
Also, see if you can get the issue to replicate consistently. Do you detect it with the same song / album?
When you hear "static" through the HE-400s, I've noticed that it is typically either a loose connection in my left cup, or replication of a clipped wave in a bad recording (excessive dynamic compression). Or in other words, the HE-400 are not distorting - they are playing back the distortion!
hey thanks for the advice. the distortion was like clipping, did not always replicate within a specific track. I figured out the problem, it was my audio drivers. after i updated em, the issue has resolved. :)
funny how i never heard the distortion before though. the HE-400 really plays things back at a high resolution and super clearly.