I have not heard of this one...I wouldn't imagine the issue being with the surge protector, but you could disconnect it to remove it from the issue. You might check for interference, like a local HAM radio operator.
I have to look further into it this weekend I only had the system a short time and don't remember hearing it before. The only reason I noticed it was because I check my SVS sub for humming because of a question on another board and discovered that my speakers hissed with only the receiver on and everything else off. The volume level was at -14.
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