(1)You must isolate the audio system from the earth ground which runs back to the breaker (fuse box). Float all the plugs which connect your audio system components into the wall. (i.e. do not attach the ground wire in to the ground prong in the plug or use cheater plugs). If you do the above, you must be sure that all the audio components are connected through interconnects that include a ground wire built in; and the ground must be connected to at least one of the components. If this is not true you will have to have more than one grounding point for the system (i.e. a separate ground one for each isolated component (a component whose ground is not connected to any other component in the system) that is separate from the breaker box earth ground). However, this is less optimal than having one grounding point for all the audio components. (2) Establish one grounding point in the audio system. This is most commonly an unused RCA plug on a preamp. In the good old days, every preamp had a grounding connector. Run a heavy gage copper wire from the OUTER shield of the RCA plug (i.e. the ground portion of the plug) to a 6 foot copper grounding stake driven into the ground which is always moist or wet. This establishes a true earth ground or zero potential that all the RFI garbage will drain to. I run MIT Z-Series power conditioners and Z-Stabilizers between all my components and the outlets. The Z-series compoenents are connected to the wall outlets' earth ground - all the garbage collected by the Z-Series components is caught by the transformers and dumped to the house ground running back to the breaker box. Then I float the audio components that are connected to the Z-Series components. This adds an extra level of isolation between the audio system and the house wiring further lowering the noise floor. You should also add some parallel RFI/EMI filtering to cleans the live and neutral AC lines of the high frequency hash. These filters will dump the RFI/EMI to the house ground. These filters should ONLY contain capacitance; do not use anything with an inductor in series with the AC lines. Audioprism Quite lines are such a filter with only parallel capacitance. You can also build better ones yourself for a lot less money (see Magnum Cables website on how to do this). Good luck. Sounds complicated but it is very simple - draw yourself a schematic of how your system and how you will isolate it. The above grounding scheme is a true laboratory grade isolating grounding system that is commonly used in laboratories using highly sensitive electronic equipment. It is well proven and you should hear a much lower noise floor and a much more relazed musical presentation.
