Someone please help me to understand cable burn-in. I mean a cable is just a cable isn't it, sure some cables are more expensive thus better than others, but how can a cable gradually sound better over time like speakers or hifi equipment can? I can perfectly understand speaker run-in, I've experienced this myself with 3 sets of speakers I've bought new in the past (moving parts et al.), but cable burn/run-in? Does such a thing exist?