I got a basic audio question. If i were to buy a new pioneer head unit, nothin special, but just something like 25wattsx4, could i hook a subwoofer up to it without having an amp for the sub? Because it is possible to put a good subwoofer, although a small one, in the box for the JBL system woofer right? I only have the premium system, but i'm guessing that i could just find a woofer box from a JBL system car, and bolt it in place in my car right? This is just an idea, but tell me what ya think.