Does anyone have any info on the non-bose stereo? Ohmage for the speakers would be nice; 2? 4? Wiring diagrams would be great, and info like, does the base head unit act as an amp itself, or is there another 4-channel amp elsewhere in the car? IS there a low level output somewhere that you could use with a sub? Or with the speakers and an outboard amp and processor - etc.,etc....