I have no idea how these things work, but I got 3 of them and the improvements in my system were not subtle. I have one aimed toward my preamp and cd player(Exemplar XP2 and Cary 303T) and the other 2 take in the crossovers for the Nola Baby Grand Reference speakers and the nearby Oasis S-400 monoblock amps. I noticed an improved clarity, greater sense of placement in the soundstage, better pacing and a much more involving sound. These things have made one of the larger impacts of any tweeks I have tried.
