I have schematics for getting the low level signals. They are front left and right, and rear left and right (just a copy of the front). If you've done an install before it shouldn't be a big deal. Mine was Bose, so I can't speak to what the non-Bose amp does, but the crossovers are in the Bose amp. If you don't have a sub (not sure what non-Bose has), there should be room under the floor for the amp (I took out the sub and mounted a signal processor there).