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How do I eliminate hum?

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I have what is most likely called a "ground loop hum", according to a friend I recently spoke with. I was able to isolate where it is coming from,but I do not know how o get rid of it. It is coming from a 20" long Canary star quad cable that is balanced on both ends, with one end being XLR and the other TRS. The TRS side plugs into my mixer. When I unplug them the hum disappears. I am able to send an optical signal (no surprise) to the pre/pro (Sunfire TGP-5) and it plays with no hum.

How do I get rid of this? Do I have to buy a ground loop hum eliminator or is it possible to build one? I am pretty good with soldering, etc. Is there some other way to get rid of it?

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Topic - How do I eliminate hum? - computerman 17:07:05 06/15/12 ( 29)
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