Isnt that jbl amp 300x1 at 4 ohms? If so, just wire the positive on the amp to the positive on the sub, and the negative on the amp to the negative on the sub. Then the sub will get 300 watts rms which should make that sub move pretty good.
TEDD
Do you have the owners manual for this amp? If not, i think Will has the same amp and can probably help you out. I kno for a fact that you will want to get rca splitters so u can run signal to all the rca inputs.
TEDD