DT,
I too have a rxv-2500 and wanted to run m-80's, but a call to Axiom changed my mind. They said that the yamaha just doesn't handle 4 ohm loads well and it will shut down/overheat way before you want it to. They said it would drive a pair of m-60's(8 ohm) much louder than a pair of m-80's(4 ohm)(because of shutdown/overheating)
Hope this helps...
