JaZZ
Headphoneus Supremus
That rounder sound on the hd800s is not double amping signal distortion, it's called driving the 800s to there potential. That has always been an issue with the 800s. Amping has nothing to do with loudness, more to do with fullness and impedance/power provided to the drivers. The that a accurate feel comes from under driving causing exaggerated treble. If that's what you like good for you but I will go rca out to my v200 or Zana or even my old xcan amp over the little portable one inside the Hugo on most of my headphone to get the full potential of the Hugo dac.
«Driving the 800s to their potential», «fullness», «impedance/power...» (?), «underdriving» are no technical terms which would explain how an extra amplification stage could «improve» the signal or the driving capability. They just show your sonic preference – which I share to some degree, that's why I have done the modification on the HD 800.