Why Do I Have Feedback on My Home Theater System?

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I recently installed a home theater system. I have a nice 50″ plasma on the wall. All the wiring is hidden. I have 5 infinity speakers all wall mounted. I have a Denon AVR receiver, and I utilize Cable TV through Comcast.

No matter what I try, there’s still a constant buzzzzzz or some might call it a hummmmmmm coming through my speakers. Most of the time you don’t hear it since there’s programming coming through on the TV. But if the TV gets cool down, it’s there.

I have maximized the settings. I have the TV signal all the way down. The Comcast Cable Box signal all the way down. And I use the AVR signal as my main signal and that helps a lot, but the buzz is still there in the background. I’ve been told it’s since I’m by Comcast Cable and there’s nothing that can be done in this area it, but surely there’s some kind of electronic silencer I can use to take that buzz out.

Answer by Neil N
Have you tried by a potential/line conditioner?

http://www.amazon.com/8-OUTLET-Line-Conditioner-surge-Suppressor/dp/B000A1A1P8/ref=sr_1_1?ie=UTF8&s=electronics&qid=1198075706&sr=8-1

Answer by SgtPepper
It sounds like a ground loop conundrum.

Try to place all your electronics on the single period of your wiring. Connect the ground wires as required. Keep the potential cables clubbed together and if possible through a potential line filter.

Keep the speaker cables away from potential line and if they must cross, cross them at 90 degrees.

Try changing the orientation of your plugs. One way is usually quiter than the other.

Most vital business among the tips that I have listed above is to ground your system properly.

Answer by tammkln
When they delivered and hooked mine up, I establish that they had the wires incorrect and that flat it for me.

Answer by He who must hold the diffident
There are 3 ordinary ways hum gets into your system:

A) CATV coax

B) Ground loop with a self-powered sub

C) 60hz AC noise getting into the wiring.

Here is how you can test some of these:

A) Turn the system on and turn up the volume so the hum is noticeable. Un-screw the main CATV coax cable. If the hum stops, contact your CATV companionship and have them come out and ground the coax just further than your house.

B) Get the system to breed the hum and un-plug the subwoofer. If this hum stops you have 2 ways to solve the conundrum:

- Get a 2-thorn to 3-thorn adapter and place it on the Subwoofer potential cord.

- Get a “Subwoofer” cable with modest arrows. This RCA cable does not connect the shield at both ends. This breaks the ground loop.

C) We are now left with wires running too close to AC potential cords and this is injecting noise into the system. You in the end have to try disconnecting some of the interconnects in a trial-and-miscalculation attempt to see if any one wire is causing the conundrum. The other source may maybe be the speaker wires (are these in-wall?). Once again – try one at a time test to see which wires are causing the conundrum.

I hope one of these techniques help footstep down the conundrum.

EDIT:

This is rare – but it may maybe happen: Look at the back of your gear rack. Are the AC potential cords separated from the interconnect and speaker wires?

You really want 3 separate bundles of wires that stay separated: AC potential cords, Speaker wires, Interconnects.

Make sure your AC potential cords are not bundled tightly with the other wires.

Answer by Paul in San Diego
Sounds like you have a ground loop conundrum, where your cable TV system isn’t properly grounded to your home’s electrical supply. I had this conundrum with remodeling my home. I had gutted the house out to the studs and ran all of the cable outlets in the house to an gear panel in the back of a closet. I also installed a distribution amplifier to boost the signal to each outlet.

When I hooked up the TV and surround receiver, I got a constant 60-system hum from the speakers. Since the wiring was new, I figured the ground system would be correctly attached. So, the conundrum had to be that the cable system was improperly grounded.

To fix the conundrum, I ran a ground wire (in this area 12-gauge) from the body of the splitter where the cable came into the gear panel to a screw on the chassis of the distribution amplifier. This place the cable ground at the same potential as the electrical system and the hum went away.

What do you reckon? Answer below!

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