I checked Albert's suggestion--there is some very good information there, but those posts are a little dated (not that the information is less relavent--but new posts will get some additional information). About 2 years ago I added a dedicated 220V 30amp line. Using a toroidal transformer I stepped this down to 110V 60amps (very close to the audio room). From that I ran 4 separate 20 amp circuits, with 10 gauge wire, Hubble outlets, indendent industrial EMI and RFI filters and independent true grounds. The step down transformer gives you 55 volts on the + and neutral pole of the plug. It is out of phase so it acts as a noise cancelling system. I agree with Jfrech--this is cost effective!! I was having a lot of work done at the house, so the cost was $500 + the transformer and filters. It was done by a licensed electrician (which I HIGHLY recommend unless you are very competent or you want to burn your house down). I do use some additional line filtering at the source components, and oddly enough found it to make a bigger difference on the digital equipment than the analog equipment. In fact I'm not sure the additional filtering has had any affect on the analog equipment, but it definitely does on the digital. I haven't figured out why. Okay, I've rambled long enough--good luck to you.
