The man who first introduced BALANCED amps if i'm not mistaken.
whoeva has the HD800/Balanced Ultra Desktop Amp/UDAC/Desktop Power Supply from Headroom pretty much heard the pinnacle of sound quality.
itz subjective i know. ;)
my first audiophile headphone was the sennheiser hd 595s. wow. such a day/night difference from the bose i was listening to (which at the time was a major upgrade to the cheap Phillips headphones i had. haha)
then a few years later (& lots of research), i went all out!
i purchased the HD...