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I had a bunch of problems with a recent Denon and noise. One issue is present until I put the unit into ECO mode. The other required me to add a common mode filter to my input AC (I used an emotiva cmx-2).
It’s been frustrating because I’ve been running Denon AVRs for years and this newer model is the worst of them all for noise issues (AVR-X6700H)
Is that a dryer vent duct?