Special Sub-Woofer IC's

I currently have my Sunfire HRS Subwoofer connected to my pre-amp outputs with full range cables and it sounds pretty good. The question is, are supposed "Subwoofer" cables preferable? Do they really make a difference, I would think that a full range cable would be better, sending the full spectrum to the sub and then letting the sub decide what to reproduce, or am I incorrect? Thanks!