I've owned several Pass amps and preamps myself. I likes the amps very much but not the preamps. If it were me, I would keep your cd player and put all the money towards the best preamp you can. The M6 is a great player. Getting a better preamp will be a much bigger change. If you are willing to buy used, I would look at something by Aesthetix, Ayre and BAT. There are other great brands as well, but this is what I would start with.