I have a Denon 3803 and I can play a total of 7 speakers plus the sub at very high volume for a very long period and have never had a shut down. Bare in mind that I have (4) M80 ti's running in that set of seven speakers. Denon is a fantastic amp for the M80ti's.

Axiom M80Ti(4) Axiom VP150(1) Axiom Qs8(4) Axiom M22ti(2) Axiom M3ti(2)