Just a comment, since I'm in no position to know Audio Magic's current design. I'll be a bit surprised to find out that a passive plc can 'perfectly' isolate digital and analog, though any moves in this direction are [much] better than none. Anyone coming from a mixed signal or digital ic background knows the difficulty of preventing digital noise transfer, and most passive plc's are not very heavily engineered. Just skeptical of the word 'perfect' in this context, despite the separate power cords, though I could be wrong.