Used primarily on the AC cords for digital gear, though results are dependent on the type of after-market AC cords you are using. They also work on signal cables, especially ground wires from turntables. Subtle reductions in noise with an improvement in detail, clarity, and those desirable musical cues that make everything sound more real. I pretty much hear what is claimed from the manufacturer and other reviewers. Causes a smoothing of the sound, with less noise and grain or grit.
Silences are more silent, with the highs becoming more articulate and delicate.
Available at most automotive parts supply houses. Correct or reverse AC polarity on all components, as determined by either multi-meter measurements or through listening. Subtle but telltale improvements in detail and musical cues, perceived as an increase in soundstage and localization information. Depending on the component, you may also notice less grain and grit as a result of a lowered noise floor. Routing of all signal and electrical connections to reduce potential interactions.