i'm not sure that i understood your question, but if you're talking about running wire from the sub to the speaker terminals on the outside of the box then just use speaker wire, 14 gauge is probly fine.
The type of wire doesnt really matter either. Here lately ive started to use 14 ga. extension cords that I had just laying around when I didnt have any speaker wire. Works great, and besides, wire is wire lol.