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Folks, need help here before I get insane. So the cable guy installed Comcast box, and the speakers started to make this horrible humming noise. No matter which input I use or how loud the volume control is set. When I press mute the noise is still there, but a little lower. It's a simple 2 channel setup, screw in cable to the box, HDMI from the box to Tv, and RCA from the box to the amp. Without the amp tv doesn't hum.
I have isolated the problem to cable box and its screw in cable. When I unscrew the cable, even when the box is on, the hum disappears. Never had this problem with Directv.
Your input is greatly appreciated.
Very common issue with cable. I suspect you need what is called an "RF ground breaker" to isolate the cable. The link explains what's likely going on. The ground breaker should solve it.
The cable guy came, couldn't fix the problem, tried to blame it on my stereo. I asked him about the ground loop isolators, and he said those could help. So I ordered a couple from different brands. If they won't help I'm going to switch back to Directv.
Many will jump in & cry MURDER, but a quick fix would probably to simply install a 2 prong "cheater" plug on the amp's cord. Had to do that when I used an ARC LS3 in a system attached to cable tv - the ARC was SUPER sensitive to ground issues, and the "cheater plug" brought everything back to dead silent backgrounds.
Just Got the the ground loop isolator thingies. They work great. No hum, no nothing.
I don't think I'll experiment with cheater plug for now, however I appreciate your suggestion.
Thanks for reporting back. Glad to hear it did the trick and I didn't steer you wrong.
Those things really work great!
Maybe the (cable in) shield was not grounded properly. Sometimes
installers take shortcuts, or maybe forget. I'd call them back out
to figure it out.
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