Have you seen this thread?

http://www.axiomaudio.com/boards/showfla...;gonew=1#UNREAD

Alan Lofft basically says you shouldn't drive M80s with an Onkyo 805 (or any Onkyo). This is a big concern for me becuase the Onkyo N905 was on my short list to drive a M80/EP500 setup.