Hello all, I have what I believe to be an odd grounding issue with my A/V system. I have a cable box with hdmi to my Samsung lcd. Line level audio out from cable box to Creek 5350SE amp connected to Revel M106 speakers. I have everything plugged into one power conditioner.
I’m hearing what I believe to be a ground-related hum/buzz that gets louder when I turn up the volume. If I UNplug the TV power cord the buzz gets much louder. If I UNplug the hdmi from the tv or the cable box the hum gets much louder. If I unhook the coax feed to the cable box the buzz goes away, but then the system is useless. If I take a wire and ground the metal end of the hdmi cable to a screw on the outlet where I’ve plugged in my power conditioner the hum gets quieter.
The really annoying bit is that I can’t use my sub due to this issue. The creek has a preamp out and a power amp in that is normally connected with a jumper. I tried sending the preamp out to my sub and the line out from my sub to the power amp in, so the sub separates the bass from my monitors. Problem is the sub massively amplifies the hum so that if it’s turned up loud enough to hear the bass it’s nearly drowned out by room-vibrating background hum.
From what I’ve read, it sounds like the a/v line might not be properly grounded to the electrical ground as it comes into the building. Since I rent I’m not sure I have the ability to fix that. I think that putting an isolator on the coax line would fix the hum issue, but since I have digital cable, it will completely mess up my service.
Is there any easy way fix this? I have a feeling it’s a combination of a crappy cable box, a grounding issue and/or using a 10 year old integrated amp. I’d rather not have random wires strung from my tv into the electrical outlet if possible. Thanks!