Resolving amps

If you are attempting to run Magnepans, you should look at the Magnepan threads. They are a bit of a special case.

McCormack DNA 500 was the best at resolution I've had.

Maggies like a lot of power. I would choose between the following:

McCormack DNA-500
Modwright KWA-150
Clayton Audio M100 or M200 class A amps

IME Maggies are easy to drive if the amp is alright with the load. A lot of tube amps can do the job other than this. So if you want a tube amp, often you can use a set of ZEROs http://www.zeroimpedance.com and do quite well. Sixty to eighty watts does seem to be a good minimum in a lot of rooms though.

Windell Diller of Magnaplanar has told me on several occasions that the best he has ever heard the 20.1s sound was with a set of 200-watt tube amplifiers.