Beyond audiophile fantasies, there is the significant issue that several AVRs and some separate amps have trouble "interacting" with M80s. It is not fair to be completely dismissive of this question when so much has been written about the problem. The best way to explain to people that M80 are not going to shut down their AVR is the same way Alan at Axiom does: explain that some amps don't drive 4 ohm loads without shutting down. Marantz is not one of the companies that has this problem.

Panny 3000 PJ, 118" Carada, Denon 3300, PS3, Axiom QS8, PSB 5T, B&W sub, levitating speaker wire