I have a 12 inch Power Acoustik 4 ohm dual voice coil subwoofer rated at 2500 watts max,1200 watts RMS and a Sound Storm Labs 3000 watt high output Class D Monoblock amp which is rated at 2250 watts RMS @ 1ohm, 1125 watts RMS @ 2 ohm and 573 watts RMS @ 4 ohm.
My question is how to wire first the speaker itself as far as the dual voice coils go to get the right ohm load and then to the amp in order to get the maximum power the sub can handle from a amp with those specs>

 

With a dual 4ohm, you'll get a 2ohm final load (with the amp 1125WRMS @ 2, and your sub rated for 1200wrms, you're golden

Connect both positive sub terminals to the positive amp, and both negative sub terminal to the negative on the amp - that's parallel wiring to get you a 2 ohm load.

If you want a 1 ohm load, buy a second identical sub