The best headphone amplifier for Senheiser HD-650

Head-Fi is the place to go for advice. My advice is to look at Antique Sound Lab. I am using the HD-600 with their MG Head OTL Mark II. It makes the Senns sound sweet yet detailed. I can listen to them for hours. I wish now that I had spent a little more and gotten one of their similar pre-amps with headphone output. I would have made a small second room system by adding am amp and my new Von Schweikert VR-1s. Good luck!

Woo Audio 3!!! Get yourself a pair of good NOS tubes and a 6080wa power tube and hang on.

Get a used Wheatfield HA-2 (they're now out of production and hard to find). There's one on Agon now for $600, or if you'd like to wait 2 weeks, I will likely be selling mine for $550 (once I get my speaker amps back, the headphones will unlikely see use for months). You will find no better Senn headamp for rock music, IMHO. Very fast attack, very full sound, and lots of dynamics.

Try the Xin Super Macro 3. I have used it with both the HD600s and the HD650s. I have the optional BB OPA627s installed on it and it is superb.

You might try a website called www.head-fi.com

It's a serious website for headphone enthusiasts - there are many writeups about headphone amps, headphones, cables, DACs, etc...

Cheers,
Dennis