I considered the very same. I asked Robert Stein of the Cable Company, who sells both and has tried both. He told me if I lived in an area with extraordinary pollution, I should go for the Exact Power, if in a more rural area, for the PS Audio. As I live in Moscow, I bought the EP 15A, and was amazed by the ffect. I later added the SP15A Balanced Power product, which gave another third in improvement.
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