In Reply to: RE: Major ground loop problems after construction on new house posted by M-B on August 25, 2014 at 08:06:34:
If you have a voltmeter and some wire you may be able to measure the various voltages between your grounds. I agree with Jea48 that voltage differentials are the rub, the question is why and where. Even a $10 meter from Harbor Freight will probably do the job. Their AC LSD is .1V and your audio signals are around 1V max so if the hum is loud it's prolly < 20 dB down.
Good luck, Rick
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Follow Ups
- RE: Major ground loop problems after construction on new house - rick_m 09:35:54 08/25/14 (0)