Hey Shackman;

I am not sure about the wiring and the amps issue, but I have tried building and mounting speakers. There are formulas available on the Net for correct enclosures to get the maximum sound out of any speaker . An enclosed spaced is always better than just hooking speakers somewhere in the trunk as I used to do as a youth. They are always "phased" also. Be sure to hook negative(black, maybe) to minus and positive (red, maybe) to positive. Could be green and brown or whatever. But they work better with designated neg to neg and pos to pos. Also, enclosing them is better. Porting is also good. This is a hole a certain distance from the speaker, sometimes 2"-3" in diameter. It all has to do with correct sound. I built a set of PA speakers once for my home, and discovered the difference between speakers and musical instrument speakers. There are actually enclosure mathematical formulas available for the diameter of the speaker you plan to use. Just putting it in the trunk and using the entire trunk as your "enclosure" will not yield as good of results as an enclosure within the trunk.