I auditioned the Antique Sound Labs MG Head DT with my HD600's, but bought the Musical Fidelity X-Cans v.2. The ASL was too "tubey"-colored sounding, the MF was flatter with stronger bass and dynamics. Then again, my budget wasn't as high as yours. (I haven't heard the new ASL OTL mentioned above.)
Headphone Amp. for Sennheiser HD 580 headphones...
Any recommendations for a GOOD headphone amplifier? I have an Audio Research LS 15 pre amp. and would like to be able to listen to the headphones at night. CD player is Naim CD5. I just noticed an add for an Earmax headphone amplifier and it looked really nice.(Sold) Will set the price range up to $800. Unit could be SS or tube. thank you for your suggestions. Richard.....