ok the thing to remember is that if you want top quality cables, you need to get some which have some kind of protection against OXIDIZATION ... in other words, good quality cable does not go black but stay its original copper colour. Try and get cable which has gold plated connectors, this will increase the transmission through the cable.the cable i used to use with my sub was almost 9 metres long. Since then i have moved the sub back to under my desk and still use the same cable because there was no loss in quality from it.
Also you could try buyinq a Directional cable. These are made to carry the current efficiently in one direction only, seen mot prominently in top end hi fi sysems. You can get these real cheap from a hifi shop which may be swapping demo hifi parts around. they like to use new cable with every new install.
The simplest and cheapest solution is to buy a soundcard with digital output and use either PHONO outputs or OPTICAL outputs.
