Originally Posted by dario
No council for the Hd-650?
Receivers and integrateds that sound good should sound good with the HD650. The overwhelming majority use resistors to step down the ouput of the main speaker amps and the only real caveat to that methodology is high output impedance, which can have an audible effect on the FR of low impedance phones, but usually doesn't effect high-impedance phones like the 650. Good bets should be recent products from NAD, Marantz, Rotel, Cambridge Audio, Yamaha...the better stuff. Another really good route is 70s vintage. All of that stuff -- Harman Kardon, Marantz, Pioneer, Kenwood, etc, was very solidly built with the kind of power you need to drive your 650s with authority. Any of them that sound good with speakers should sound good with your phones. I get great results from a 70s Harman Kardon integrated and HD 580s. I've compared it to dedicated HP amps and it's still in my system.