lowering the impedance will create more power... you need to find out how low your amp can go ohms wise, and how many ohms your sub(s) depending on that you may be able to bridge or wire parallel


Bridged
you use the positive of post 1 and the neg of post 2 etc
parallel, you use wire normally however you run one wire to two speakers by splicing in the middle, and adding an extension, doing this the wrong way can DEFINITELY kill your amp.. but it sounds like maybe you should just go buy a jbl or something anyways, they have plenty of information on wiring their products, they work well, and theyre not very expensive at all

theres 2 cents for you