How long before you hear the buzz? Right out of the box? After warm up? I just plugged mine in at the kitchen counter right out of the box. Silent so far. Oops, on standby. Now on. No buzz. More Later.
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Outlaw M200 x4 / Monster 3250
Harmony 1100
Sony 55HX800
x-Statiks, x-voce, x-omni