I have a polk hooked up to ACDC right now. When I first got it, I just curled the wires around the in-cab speaker and it was fine. Eventually I found some alligator clips and was able to attach them to the wire in a secure way without needing to solder them. I threaded the wires under the mesh and out the venting holes in the back of the cab. Works great.
I read in another thread that you can connect four games to one sub, because the game audio is mono anyway (and there are four ports in the back of the sub (two sets of L & R inputs). Anyone try three or four? I would think it should work fine, though I suppose it would become muddled if you were playing them all at the same time?