There is no good category for this item in Audiogon. Check out the review at http://www.dagogo.com/bsg-technologies-qol-signal-completion-preamplifier-review and TAS and Six Moons. This device will expand the width and depth of your soundstage and enhance the realism of the recordings. I used this in conjunction with the Lyngdorf RP-1 ( also listed for sale) in a very high-end system with amazing results. Please check out my other listings as I'm in the process of selling many years' worth of accumulated extra equipment.