I am using Ric’s Music Purifiers on the crossovers for my rebuilt Apogee Duetta Signatures: two pairs on each crossover.
They absolutely make an entirely positive difference (Duettas, Parasound JC1+s, Rossi L2, Silversmith Fideliums, both analog and digital sources).
Here are my specific impressions:
—sound is immediately smoother, volume slightly but noticeably lowered, but dynamics not affected at all
—soundstage opens up quite a bit, width and depth
—what could be occasionally biting in higher frequencies before is not now
—details emerge from the mix that were buried
—more air
—instruments sound more musical, more like themselves
Overall, the system sounds more like itself. The improvement is immediately noticeable but becomes more evident over time.
I would rate the degree of improvement as roughly the same as a power cord change.
Given that Ric allows returns AND covers postage, I don’t think one could go wrong in trying these.
I ain't taking them out!