Question about Standard (CRT) Televisions

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Noise coming from cable

This question is in regard to a sound system in a night club. we have no problem with cd players, air tunes, or any number of instruments being run through the sound board. but the cable tv signal has a buzz. the cable is plugged directly into a dvd player, and then rca cables are run from the dvd player to the board. the buzz is audible even if the dvd player is off, even completely unplugged. dvd's, when played, have no such buzz, and are connected to the sound board with the same rca cables.

when the dvd player is unplugged, as i said, you can still hear the buzz (when cable input is selected), unless you disconnect the coax. then, no buzz. thus, i've isolated the source of the noise to the coaxial cable.

how do i get rid of it?

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  • soundproblem Feb 09, 2008

    I'll try it- thank you.

  • gbeavers5 Jan 25, 2009

    Hello. I am getting a buzzing through my speakers in my theater. When I unplug the coaxial cable from the back of my cable box, the noise stops. So when I watch movies on my ps3, I alway unplug the cable box. When I watch tv I just put up with the noise. Is there an in line fliter that I can use. I think that I may not haveused magnetically sheilded speaker wires when I ran every thing in the walls and ceilings

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6 Answers

Hd a

Posted on Feb 11, 2008

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I agree with all that has been suggested.. The problem is that the cable is not grounded properly so it works as an antenna picking up 60 cycle noise which gives a nice low frequency hum... make sure the cable goes through a ground block and that the ground block is attached to a good ground or to the ground wire of the rest of the system. A shorted cable would not give you anything.

Posted on Feb 10, 2008

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What happens when you run the cable directly to the mixer? Have you tried that? Also, it may not be a problem with the cable but rather a "ground loop" generated from the cable box or TV. My guess is that the cable box or TV do not use the same electrical outlet. This is where many hum problems develop right form the get-go. I would defintely lift the third connector from all parts involved, one at a time, until the problem clears. I seriously doubt that you have a bad wire if you are able to get sound AND buzz through this hook-up...accordianman

Posted on Feb 09, 2008

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It sounds like the installation of the cable wire from the main pole is not grounded properly. In an installation such as this, there should be a coax grounding block that is grounded to earth ground outside somewhere. I have seen the ground come loose on these blocks and cause your problem. I have also seen taking a ground lift and plugging it into a grounded plug eliminate buzz in a sound system. That would work only if your sound board has a three prong plug. What I mean by the ground lift is that small grey adapter you use to adapt a 3 prong plug to a two prong plug. Good Luck

Posted on Feb 09, 2008

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Coax cable from cable company has a small negative voltage
on it that can cause buzz.....input to DVD player is for what
purpose ? to transfer the signal to a clean output for the soundboard....try a different isolation unit like an A / V switchbox
for cable in = audio right & left out........... or temporarily try a VCR input for better isolation...............................T.

Posted on Feb 09, 2008

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Have you tried a new coax it could be shorted some you might want some heavy duty cable and good connectors

Posted on Feb 09, 2008

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