I'm considering buying a PinballPro combo speaker/subwoofer kit and I'm wondering whether this is something that I could just do myself and shop the local car stereo store for a good deal. Has anyone gone this route? It appears that the PinballPro speaker system incorporates a "network" that routes some sounds to the subwoofer - not sure if this Is something you can do on your own. I have no speaker knowledge whatsoever, but, then again, I had no pinball repair knowledge a year ago either...