One thing to consider is the M80s are a more efficient speaker than the M60s so it would take LESS power to achieve the same spl with the M80s as it would the M60s.

Secondly the Denon would increase in watts available to the speaker @ 4 ohm. You will have LESS power to run the LESS efficient M60s if that's what you choose.

Rick


"A fear of weapons is a sign of retarded sexual and emotional maturity." Sigmund Freud