If you have cable or sat tv unhook it and see if hum is gone. If it is (and I bet it will be gone) then have your service company fix the earth ground, it will be free.
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I often disagree with your advice, but I think you may have hit the nail on the head this time. Since DirecTV installed Whole Home, connecting the receivers to our LAN, a noticeable hum was introduced to what had been a silent system. I thought the unit they attached to the receiver might be too close to something, but perhaps it needs to be grounded. I'll follow up on your advice. Thanks.
Chad, I meant both. You're very free with your advice/opinions, some of which seem good, some less so. Of course, opinions are what they are; advice can be misleading.
I've been playing with audio for over 60 years, my doctoral and post-doctoral work was in psychoacoustics, yet sometimes I've contributed ill conceived posts to this site. I'm trying to be more reticent in my urge to respond, but my snarky nature gets in the way. Kal Rubinson has got me off base a few times, but then I find his posts often too cryptic to be useful.
Anyway, thanks for the lead about grounding the connection to our LAN; I'll follow it.