3 channel amps? Didn't know they made any. I'd go with a three channel in that case. Lots of 6 ohm center channel speakers out. Or, if running two speakers in parallel, that will be a 4 ohm load.

When I set my twin M22’s (center) and M80 (mains), I had to set the M22’s 5 db lower to equal the M80 mains. I thought that was odd.