See if you can find a used Little Dot tube headphone amp.
I have one and it works great with my HD580's.
I have one and it works great with my HD580's.
Sennheiser HD650 Headphone Amp
I have unexpectedly ended up with a HD650, and do not have a single component with a headphone jack, though it sounds surprisingly good direct into an ipod. I would like to find a headphone amp, under $200 used, or possibly an integrated amp or CD player with a good headphone jack. I liked it plugged into s friend's Decco but would prefer not to spend that much.