Everything goes through the same a/c box, and goes into a single outlet in the wall. Is there a way to "separate" each individual power supply, and stay in the same rack?
(sounds iffy)

Also, since it is NOT a constant problem, I'm more inclined to think that it's an RF issue too. Some rooms, it never happens. It's mostly just ONE room. I guess I'll have to do some more "room comparisons" before I have enough data to compile a "real" solution. There are still a few unanswered questions.
Thanx for all the advice, but what I'd really like to know is:
More about an EXTERNAL sound card so I can have a higher quality, cleaner signal everywhere.
Always searching........................
"It's ALWAYS something"
(Thanx Rosanne Rosannadanna)