I have found a Shatki stone works well under power supplies. Also BDR products will help with power supplies along with Audience power conditioners.
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Several experts have recommended having your digital components on a separate line from your analog ones. I am currently doing this on faith but have not done exhaustive tests to see if I could tell the differences. I intend to do so at a future date but other things have a higher priority. You can look at their arguments or try it yourself if you have separate lines handy as I do.