Now, I think that certain cables will change the sound. For example, if your cable is poorly designed and is too high a gauge for the distance, you're certainly going to hit resistance and end up with some roll off on the high end--eg less brightness. I've also heard of cables with little capacitors in them. Who knows what this atrocity does to the pure, pure signal. But a regular cable of the appropriate gauge should make no difference to the sound.

I am the Doctor, and THIS... is my SPOON!