add me to the list of lovers of the 501 .
these are beautiful and very musical. My biosciencegeek cmoy however is just not enough to power these bad boys, when i listen it feels like there is something being held back. I just purchased a ibasso p2 which is on its way and reading the reviews on this amp it sounds like it was made for the 501's. I remember reading somewhere (maybe this thread) about people re cabling there phones and wondering about the wiring. if you look here http://www2.akg.com/mediendatenbank2...5d21891b68.pdf it is clearly laid out for all the DIYers in the crowd.
i will post more when my amp arrives