I've got a 6 year old JBL 10" subwoofer (home theater sub, not a sub for a car) that has suddenly taken to making a constant rhythmic knocking sound, even when not in use by the receiver. The sound is ...
recently I bought receiver Onkyo TX-NR656. But after plugging the rec. to my system, it makes a humming sound on power up. I thought the problem would be with the speakers so after series of tries (un ...
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