The v4 version of the M80s are 4 ohm speakers and I believe the v3's are too; the Denon is not rated for 4 ohms (6 min) so it's possible that's the problem.

Other than that, have you checked that you don't have a speaker wire strand touching the wrong post?

Last edited by Cork; 04/09/23 02:55 PM. Reason: forgot a word!