Mapman, well said.
But some still believe Cables are Magic!!
If they were I think you would see real audio companies such as ARC, Cary, VTL, Sanders, Soundsmith, Magnepan, Wilson, Vandersteen, etc really stress cables.
They don't, and just tell you to use a quality cable.
Check out what these guys use at Audio Shows if you want to know what really makes a difference.