Bob,
Haha yep, yesterday I got around to reading an article (I forget if Muncy or Whitlock did it) but they wrapped a power cable and a balanced XLR cable (and mic to record the noise) together multiple times in a large coil and even ran a huge halogen light off the power cable to get a ton of draw, and still the only noise through the microphone was the audible click of the switch for the lights, no noise from the power at all. That greatly simplifies things for my room, especially if I elect to mount the computer outside of the room in a small rack.