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There may be a subwoofer mute function on your amp. The sub out is nothing more than a preamp output with a low frequency response. It is meant to be amplified by an external amp. Either check your powered subwoofer for operation or look through your operators manual for a sub mute function.
I have had the same problem, since there is no "mute" button on the receiver panel. My power cord on the receiver was plugged into my cable box and I was told this is not correct. I unplugged the receiver from the cable box and plugged it into my power surge protector and no more "mute"!!! Hope this helps.