if your yamaha has preout then you can add an additional 2ch amplifier or 2 monoblocks dedicated for the M80, and run the M22 off of your yamaha, if you stack or pair them together I suspect the overall sound quality is going to suffer due to the different nature of amplification. my advice...not a good idea.
Just use the M80 as your main and setup the M22 in other room. You said you want more punch, how about getting another pair of M22 and run all 4 of them upfront? parallel them will give you a 4ohm load, assume you yamaha can handle it. Technically, 2 pairs of M22 have more drivers(cone area) than M60, and they should have very close output to that of M80, with less bass extension but you have two 12" sub to handle the lower region so that shouldn't matter, left alone 2 pairs of M22 = $800 and 1 pair of M80 = $1100, you do the math :-) If you must pair the M80 and M22 together, then wire them in series and that will give you a 6ohm load.
