Just FYI, I have heard a setup with 5 M80s, 2 QS8s and an EP600. It was rather staggering. Dude was powering it with 5 Parasound amps, as I recall.

That said, he was having shutdown issues originally (with Outlaw amps) because of how loud it was (>115dB) and the fact he was running 5 4 ohm speakers, not because he mixed 4 and 6 ohm.

I am the Doctor, and THIS... is my SPOON!