Ricky Reboot Dean Posted March 22, 2015 Report Share Posted March 22, 2015 So I am using my harman/kardon AVR 20II as my amplifier for some 12" towers. It sound good and all that. Puts out a decent sound and nice power. when I add an RCA to my Sub output I get a buzzing in the subs and speakers. If I unplug the RCA I don't get it. Any idea why? I would hate to have to but a new amplifier. Link to comment Share on other sites More sharing options...
dohckiller808 Posted May 7, 2015 Report Share Posted May 7, 2015 Do you have a 3.5mm to rca jack? Try using your phones headphone jack and go directy to that amp to isolate from the other equipment. Link to comment Share on other sites More sharing options...
bigmizzle99 Posted May 7, 2015 Report Share Posted May 7, 2015 Ground loop. Is it a powered subwoofer? If its a powered subwoofer, put a cheater plug on the subwoofer power cable. should fix it. Camaro SS Build Altima build 2.0 Altima build 1.0 Link to comment Share on other sites More sharing options...
bigmizzle99 Posted May 7, 2015 Report Share Posted May 7, 2015 cheater plug Camaro SS Build Altima build 2.0 Altima build 1.0 Link to comment Share on other sites More sharing options...
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