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Subwoofer plugged in causes speakers to make a screeching sound only during games.

NickTheMajin
By NickTheMajin
in Troubleshooting
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I have two systems plugged into my PC. One that goes out to my surround sound for my media room that includes rotel separates and Martin logan electrostats over HDMI. 

The other goes to another receiver dedicated to my PC speakers. A pair of Logan bookshelves and a sonance sub over optical. 

For whatever reason, only during gaming, I get a screeching sound out of my speakers and subwoofer. The screeching sound seems to increase and decrease due to the frame rate of the game I’m playing even with the volume all the way down. 

I can remove this screeching by either unplugging the subwoofer or by turning off the game. So I think I’ve at least narrowed down the sub. I have a subwoofer cable with grounding forks that I’m using to no avail. I’m on the same power strip as the PC and receiver. 

It seems like the coil whine from my PC is leaking into my speakers but only with the sub plugged in. 

Any ideas?

My system: http://imgur.com/a/la41r

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