I don't have a headphone amp for them, no. I do, however, have a tube preamp that has a pretty robust headphone section. With the high impedence Senns I can definitely hear a difference between my HK receiver (had to crank the volume way up) and the tube preamp (doesn't require so much extra juice to make the Senns sound good). The preamp is on the other side of my room and I've been looking for a separate headphone amp for my computer desk.
I'd be a little wary of overseas shipments, too. But, like you said, and have confirmed, David has excellent feedback and doesn't seem hard to contact.
Peter, how much heat does your Little Dot put out?
