how many ohms are each of the coils on the sub? You'll want to achieve a 4 ohm total load for the amp... If the coils are 2 ohms, wire them in series... positive from the box terminal to the positive of one of the coils, then the negative of that same coil to the positive of the other coil... the negative of the second coil to the negative on the box terminal.

If the coils are 4 ohms a piece, you'll need to run the amp in stereo to avoid overloading the amp... which is just positive and negative of each amp channel to one coil a piece.