I recently added a device from Environmental Potentials to my electrical panel that had a substantial impact on the sound of my system. Mostly the improvement is in lowering the noise floor and allowing more detail to emerge in a warmer sonic landscape. I'm no electrical engineer so I cannot begin to explain how the thing works but I do know that it provides protection from lightning and other line surges and also filters out hash introduced by any of the circuits feeding/leaving the panel. I do have a dedicated line (20amp) that runs from my new 200amp service about 5 feet to a series of three Porter Ports behind my entertainment center. I also had copper buses installed in the panel. All these updates were incorporated at my direction by the electrician who replaced the service to my house. (BTW, the transformer sits on the pole in front of my house--a bit of luck there). And of course, everything I told the electrician to do came from suggestions made right here on the A'gon so thanks everyone. Hope some of these ideas are helpful--basically I agree, get good power to your gear.
