Quote: Then it's not a matter of lot's of power requirement or not, you just need a better overall amp than either the Sunrise or the Bravo/Indeed. In relation to a FR graph and the way impedence behaves, the K/Q70X doesn't need a lot of current and stays steady at the nominal rated z it is at. As I said, it's not really current i.e power that makes things sound good it's synergy. Quote: If you're driving the HD600's or high z headphone, I'd look no further than a Bottlehead Crack which punches above it's price/sound performance ratio by a lot. I'd look into a the Schiit line of amp's with that sort of budget, $350-400 should leave you plenty of left over $$ to get yourself a nice headphone with spare change. Quote: +1. Also a good recommendation.