It does sound like an issue with the 805 but I would try as Ken suggestsd first, just in case the speaker for some reason is reacting with the changes in the avr. I would also turn off all multichannel processing in the 805 and run it stereo only to see if that stops the problem as well.


Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70