i have two speakers...they are factory and there is nothing in between them. Yes the whole system is ac delco and it cam with the car. there are six speakers total two in each front door and the two in the back. I have a 99 grand prix gtp. Amazing I can fix any thing on the engine but can not figure out this audio stuff. the only thing under the back is a black cover where the light in the rear window is at. Thanks for your words of help. But I think I have a different grand prix that you are thinking of. I still open for suggestions
