I don't have the 5003 with my M80's, but I've had 8001 and 8002 paired with M80s (Epic80/500 combo) with no issues. The 5003 was paired Vienna Acoustics Beethoven Baby Grand and had no issues either. Not that I really played it very loud or anything, but it had no issues.

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Denon 4520, EPIC80/500/VP180 Speakers