I just finished the Quartet 10 build when I turn off the source I get a low volume pulsing rumble from the subwoofer almost like a slow wave, is there a way i could put in filter cancel this out? Is it 60 hz energy from the 120 v ?
I had the same problem. As soon as I disconnected the cable tv wire from the wall, the noise was gone. I think it is definitely 60hz. When I boost 60hz by 15dB with no music playing through the sub, and have the cable connected to the wall, the ground noise is a lot more pronounced.
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