The Mutec reclocker improves sound quality in a digital sound system. I have used it with two digital sources of high quality (CD drive and music player) and two DACs. Sound becomes more spacious with a more natural tone and it sounds more live and less reproduced than before. As I understand it, digital sources have too high jitter and Mutec reduces it. It has worked very well for me.
It is necessary to set the reclocker correctly and maybe you have to read the manual but it is not difficult when you have done it once. RCA digital cables are not the best choice because you have to use an adapter, I prefer XLR and BNC.