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Magnetic interference from my Sunn 1200s

Just thought I would check in again, I tried the tests suggested, and there is only hum when the units are within 3 feet of each other. However, there is a "sweet spot" when the ART is at the top of my rack case, where the hum is significantly quieter, but still present. So that's the configuration I'm running right now.

Ok, then you have legitimate magnetic interference hum....... if you have found a good setup, leave it like that!