Raindance,

I have asked the same question, regarding appropriate receivers to use with the M80's, to both the Axiom technical line and Alan Loft (resident expert on the site for Axiom, I believe).

1) Alan only recommended the following receivers for the M80's:
Denon, Harmon Kardon, and new NAD because of their robust power supplies which will drive the 4 ohm load, despite the manufacturers warnings.
He said avoid Onkyo and Sony...they will shut down with any low impedances.
Yamaha very good with all but the 4 ohm load.
2) The Axiom techniacl department recommended Denon, Harmon Kardon and Outlaw 1050.

So I would say any of those four will be fine. I thought someone mentioned on the message board that they used the Yamaha RX-V1400 and the Axiom M80's with no problems, but as far as I can tell Axiom doesn't recommend it.

Rob