Shorter interconnects and speaker cables are theoretically better sounding than longer ones, and longer power cables are better than shorter ones (just don't makes loops out of excess cord - it creates a magnetic field). Also, don't run the cords close and in parallel to each other, try to have them cross, if unavoidable, at 90 degrees.
Whether or not you can hear the difference (all other things being equal) may be questionable, but doesn't this business rely on the theoretical, specifications, etc.?
Psychoacoustics - if you think it sounds better, it does.