suggestions for a headphone amplifier

How big of a sonic improvement are the Sennheiser 650's over the 600's?
In what all ways, sonically, are the 650's superior?
Thanks.

The Senns seem to like a good tube amp based on what I've read. I would shoot for the ASL tube amp. Try that for a while. If you have more to spend, but some Walker SST, first, paint all of your connections, then listen. If you still require greater fidelity (or maybe you have a greater budget at the onset than what the ASL tube amp would cost) then buy something better.

I own a set of Sennheiser HD-650 and a HeadRoom MaxedOut Home. Truly a great combination. I tried the Musical Fidelity X-Can V-3, good with Grado´s sets. The HD-650 does need more power do drive them.

Regards,

I second the Antique Soundlabs MGhead. If you can spend more, then Headroom amps will better the sound.

Rob

Of course this is only MY opinion and based on MY tastes, but I have tried a TON of different headphone amps and the BEST I have tried with my Senn 600s and 650s is the Moth Audio S2a3. E-mail me offline if you have any questions.

Frank