Is there any audible difference between the regular radio shack type speaker wire, and the expensive monster cable speaker wire? I know the monster cable wire is very flexible, but can you hear a difference? They had a demo setup at Circuit City that allowed you to switch between a left and right speaker, both speakers were identical Polk Audio bookshelf speakers, and supposedly the one speaker had regular speaker wire, while the other one had monster cable speaker wire, and you could alternate between the two with a knob. I will say that the speaker with the monster cable wire sounded better, but there is really no way for me to know if that was the only thing that was changed whent the knob was turned. So is there really a differece, or is it just some sort of marketing gimmick?