The purpose of the AudioDesk Systeme CD lathe is not to true discs that may be slightly eccentric, it is to trim the edge at an angle so light does not reflect back into the disc. It comes with a permanent black marker to mark the trimmed edge and the center hole for further reduction of reflection. I hear differences on every disc, some more than others. Resolution and soundstaging are improved, as well as bass being more defined and tuneful.
