is this a mono amp? hope so. ok run the dual 2 sub, + of 1 voice coil to - of other voice coil, run the wires to the terminal inside box, do the same for the other box.then run the wires to the amp, twisting + to + and - to -, it should create a 2.66 ohm load. as long as this is a mono amp.
what brand is it and model # or you can run each sub voice coil + to +, - to -, do that for both subs, then on the wire going to amp go + to - and - to + (series) for a 3 ohm load.