HELP I think I have an electrical issue??

Tim,
I am wiring a cabin right now and have been reviewing my electrical book with this issue in mind. The house curcuits are all tied together at the main breaker panel so spikes, surges and noise generated within the house can move between them. This agrees with experience in my current cabin. I wonder if making sure the dedicated line is on the opposite panel bus (110V leg) from your furnace or noisiest 110V appliances in general would provide the needed isolation, or if the neutral bus would still allow contamination of the other circuits. 220V appliances are connected to both busses so there may be no escape there. Also, the book says that surge protection mounted at the main panel will deal with spikes generated within the house. Is there a conditioner/filter that could be connected at the panel to deal with noise in general?

Tim,
I have been following this thread with interest. I have two points:
1. Did you say that you had confirmed that your dedicated audio circuit is not on the same hot buss as the furnace?
If those two circuits are still on the same hot buss, I would be interested if moving one of them to the other buss solves the problem.
2. A simple passive power conditioner may also solve the probem. In my small cabin, one curcuit feeds my audio system as well as a laptop computer (and refridgerator). The laptop was putting noise on the line simply by being plugged in, and much worse noise when its processors were working.
A PS Audio Duet power conditioner eliminated the noise. I first plugged the laptop alone into the Duet and that worked perfectly. I then plugged the amps alone into the Duet and that worked perfectly as well. I run it that way because I can then plug the CD player/DAC into the Duet's other isolated outet. This arrangement isolates the CD player from the amps and allows for the filtering of noise from other things on the circuit (e.g. fridge).
Regards,
Charlie