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Hum in Speakers with New Dedicated 20 amp Circuit

I just ran some 12-2 from a new 20 amp breaker and installed a dedicated outlet for my system. Now I get a very audible hum in both channels. If I switch back to the shared 15 amp outlet, no hum. I checked the new outlet with a tester and it checks out as wired correctly. At the electrical box, the black wire is connected to the breaker and the white and ground are attached to the same ground strip. I’m using a 20 amp receptacle.

Anyone with thoughts on how to resolve?

mjjw

Showing 1 response by ozzy

ozzy's avatar
ozzy
7,211 posts
 

As Erik expressed, somewhere within your system you are picking up the ground noise. Try a plug cheater adapter to lift the ground just to see if hum goes away.

If that does not help, try disconnecting cabling that comes from other sources outside your new dedicated line.

ozzy

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