Just for the record, in case anyone is wondering about this tiny amp..
this SMSL SA-50 T-amp, 50w x 2, 2 by 4 inches, about usd70,
powers the HE-6 cleanly, sounds effortless..v impressed...via my NBF10.32 on high gain.
I was transfixed on vocals, something that didnt happen so far on the HE-6. :P
( its easy on the hd650 for vocals )
I didnt hear any hiss or humm on the HE-6 or LCD2,
but slight hiss on the D7k... my initial feedback.