I tried this when I got home as chris3g suggested above. With the vol. at -05 (much louder than I can stand) I hear absolutely nothing when I switch off my cd player. If I crank it all the way to 10 there is a slight hiss at the speaker but I bet a Lexicon would exhibit just as much hiss. Overall, I'm very, very pleased with this product. More to say later once it's broken in and I've figured it all out.