it might be possible that the "smooth" and silky sound signature feels that way compared to a d2k... i also felt the more whispery sound of hd650 was more intimate and more involving that the liquidy sound of he500 but it is a matter of getting used to the sound signature and these things disappear after a week or two as you get more accustomed to the sound signature
Dead on answer.
To bring that much needed distortion back when listening to genre such as rock, maybe a little tube amp might help? or running the HE500 off speaker taps also will open it up a touch more. I've had experienced both of suggested personally though TBO, the difference is not huge.
Edited by koiloco - 9/29/13 at 10:25am