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60 Hz. Ground Loop Hum Elimination
by AudioGuy
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This is in reply to a posting in the Forum on 60 Hz. Ground Loop problems by a Mr. Johnson at http://www.totse.com/en/technology/science_technology/60hznm.html
Mr. Johnson,
This should solve your 60 Hz. hum problem. Buy a Ground Loop Isolator made for car audio, and connect it between your P.A. system components to get rid of 60 Hz. hum. I did this one month ago. The isolator is made to go between a car CD player and a subwoofer amplifier to eliminate spark plug noise, but it works just fine on P.A. gear or home Audio. One major manufacturer is American International. I have two of these in my cars. Radio Shack has the same thing with their own brand name for $15. Circuit City has them also. I bought another brand called Peripherals from a car audio installation shop and hooked it between my Yamaha P.A. mixer and my Surround Sound System. This completely eliminated the hum. I also tried it between the mixer and a guitar amp. Pep Boys used to have them, but quit stocking them. It is a small cylinder about 2 inches long, with two short stereo RCA cables, one with female connectors, and one with male connectors. You can hook it up with either cable as the input, although the instructions say otherwise. Inside, it is just two small microphone transformers, which magnetically isolate both the signal wire and the shield wire of the input from the output wires. I hope this helps.
Joe
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