I know most of the people that drive m80's with no problem use Denon's, HK's, or seperates from Rotel, Outlaw, etc...

My guess is your receiver has an issue with the 4ohm 80's. However, it is interesting because normally a receiver won't go into a protection mode until it heats up a bit. You usually don't want to adjust your setting on the receiver to 4ohm.

Maybe some others will jump in here, but my guess is the receiver, but that is a guess....good luck

Randy



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