So Tom I was just applying your formula to a few amps to see which ones would be much higher ration from 8 ohms to 4 ohms and noticed the Mcintosh was 1 to 1 meaning they were the same wpc output for 8 4 or 2. what are your top few choices for thiel? Right now still need ALL electronics for 2ch/HT line up is CS 2.7 left right mains, MCS1 for center, CS 1.7 for rears and 4 Thiel Power plane 1.2's and Two SS2 subs. I have to get this right,,,, way to much to get to this point. While i'm asking about amps my goal is to end up with a system that excels at 2ch with a HT with atmos. Have all the speakers. THANK YOU Dan