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Feedback from coax cable

Hi again,


So I have massive feedback in my powered speakers out of my surround surround. 

Coming from virgin media. 

I can be on my Apple TV through the surround sound, and have feedback unless I disconnect the virgin media from the system. (Either the hdmi from virgin to surround or the coax cable to the virgin).

I have removed all unnecessary plugs etc and stripped the system down to bare minimum, to ensure it’s no power crossover: and I have also swapped the main 360 box for on from the room. 

Either way as soon as the coax is connected it introduces feedback that I hear through my powered speakers.

360 / Apple TV >>>> Marantz AVR >>>>> TV/KRK Rokit 8 powers monitors.


Never had this problem with Sky. 

Could this be a coaxial issue from outside to the house? It’s confusing me, as the speakers are fine with anything else, but not with the virgin? 

thanks in advance for any pointers 


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Re: Feedback from coax cable

Sounds like a ground loop issue, could try one of these

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