KEF sub hum when PC connected

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Joined
30 Jan 2017
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1,146
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Lincs
I’m having a fairly bad time with my Sub connected to my AVR at the moment. Whenever I connect a HDMI from my pc to my TV my sub kicks out a really annoying hum. I’ve switch power outlets but I just cannot get rid of it. It seems to be linked to GPU activity. I was wondering about an rca ground loop isolator but I’ve read mixed results. Has anyone suffered the same and found a solution?
 
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