I see... It depends on your listening habits. I would say, if you tend to listen at modest volume levels, the M22 (with a sub) would be fine for room volume of up to 2000~3000 cu. feet. If you wish to fill the room with near-reference level sound, you may want to go with the floorstanding model even for these room sizes.

I guess chesseroo, spiffnme, and other M22 or M60/80 owners will fill-in here soon.