ground loops

901 Views 3 Replies 4 Participants Last post by wrongdave, Jan 27, 2013

Fix'n it

Discussion Starter · Jan 27, 2013

hello, gents. i have an issue i hope you can give me a simple solution for.

i put my home theater up in my living room. all new 120v wiring. the main gear, receiver, amp, blu-ray player, EQ for the subwoofers, are on 1 circuit. when i had my subwoofer amp on this circuit, i had a loud hum in the subs. so i moved the sub amp into my office, separate circuit. i still have a hum in the subs, though a lot less. but it still is bothersome.

what can i try to eliminate this hum ?

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bbo

· #2 · Jan 27, 2013

found this little gem ( read the section on ground loop hum)
http://oreilly.com/pub/h/4241

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Billy_Bob

· #3 · Jan 27, 2013

I had a similar problem. I was using a regular "RCA cable" to the subwoofer, which had a LONG wire run. I switched that wire to a TV coax (shielded) wire and got coax "F connector" to "RCA plug" adapters at Radio Shack. End of problem! (There was outside radio frequency and other electrical noise entering the cheap RCA wire. The shielded coax blocks that.)

F connector to RCA adapter...

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wrongdave

· #4 · Jan 27, 2013

Do a google search for ground loop isolator.

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