There’s a nice post on Consumerist about those expensive high-end speaker cables that will apparently transform your stereo’s sound:
Seven different songs were played, each time heard with the speaker hooked up to Monster Cables, and the other time, hooked up to coat hanger wire. Nobody could determine which was the Monster Cable and which was the coat hanger. The kicker? None of the subjects even knew that coat hangers were going to be used.
As one of the commenters notes, the only time you really need heavy duty audio cables is when you’re jumping around on stage playing an instrument. Then, ultra-cheap cables are a false economy.