McIntosh 501 or 602 for Magnepan 20.1

I own Mac 501's driving Thiel 3.6 and am very happy.

Have you considered the MC2102 100 watt tube amp? I've heard this with the 1.6, 3.6, and 20.1. It's a fantastic combo. Also, the MA2275 integrated is another nice tube option from Mac. Maggies just love the tubes!

MC2102 on a 20.1? I dont think that would be a good idea, my 3.6's clipped my 1201's! As for the 2275 I dont think it could properly drive a 1.6 or higher...maybe the MMG or 12's.

Clipping point has a lot to do with room size. If your room is large, that last 3dB of volume can eat up a lot of Watts - even 1200! Arthur

I power my MG-20's with a combination of Threshold SA-1s with a Pass labs 350.5. The 350.5 sounds great on these speakers and powers them effortlessly. So even if you are not going to bi-amp your maggies I would suggest you add the Pass labs 350.5 to your audtion list. I see no problems because of not using a standalone pre-amp in your setup with the 350.5. Good luck in your audtioning ,your MG20.1s are amazing speakers!