Just some regular speaker wire, I used 12 gauge. And to get it through the box you can either get a terminal cup, binding posts, just use a bolt through the box, or drill a hole, run the wire through and seal the hole up. To wire it to 1 ohm, just wire up one voice coil to the amp, then put a jumper from the + of that coil to the + of the other coil, and a jumper from the - of that coil to the - of the other coil.