Cables are not a "belief"... their functions are supported by electrical principals and physics. This must be one of the top arguments of all time, but if we throw out the extreme stupidity involved with using "lamp cord" at the low end and then cables that cost thousands at the high end, we enter a realm of reality of where there are clear benefits given by the best conductors, shielding, terminations, solder, soldering process, etc. Will any of this make an audible difference, probably not in most cases. Is there a difference??? Yes, it is there, and I think of it this way, if I use the best possible gear that I can afford, I'm pretty sure that is a component I really do not need to worry about in my system. People will argue this to the death.