Fritz, every post has good info - I'll just add by saying I have no idea why they make a difference but they do. My first pc was 2 years ago, went on a transport into a panamax extension cord and the improvement was unbelievable, and the rest of the components had stock cords. I now have aftermarket cords on all components except my preamp which is captured. Even one on my amp, an Eel reference, which btw is an unbelievable cord, made a huge improvement. It does seem that the transport or cd player makes the biggest difference so start at the top and work down to the amp IMO.
