Buzzing comming from new Marantz SR6300


I just unpacked this beast and the first run I've made with it, just watching television, is producing this really loud buzzing.So far it's only flowing through two cambridge soundworks m80's up front , and two S300's in the rear. all connections are clean and secure. I'm stumped as to what it's comming from , anyone have some suggestions?
Thanks so much

John A.

See if this is any help; "buzzing" is a good word for the "hum" described there for an NAD. It was only in surround modes, not stereo. I do not know how to reboot a Marantz SR6300, it could just be power off and then on.

NAD receiver hum: cause and cure
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