AudioQuest SUB-1 Subwoofer Cable
If you want a great subwoofer cable, look no further than the AudioQuest SUB-1. This cable features three separate silver-plated solid copper conductors to maximize signal transfer, with each conductor having its own air core insulation layer. All three conductors together are also shielded to effectively eliminate noise, with the shield completely covering the outer sleeve of the RCA connector. The conductors are also sliver-plated copper, and attached with silver paste instead of standard solder. A very nice feature is a separate ground wire which can be connected to further reduce the potential for AC hum.
This cable is a great choice for audiophiles, and it is not insanely priced. The only caveat would be using this subwoofer cable in systems where the equipment is exposed to moisture. The silver-plated copper is electrically superior, but not corrosion resistant like gold.