I've heard the standard audio setup on the Prius, and it wasn't too horrible. Although I'm used to aftermarket audio systems, the factory Prius setup wasn't that bad and definitely do-able for a daily setup. How much better, or worse is the JBL system? I really want to keep this car stock for the most part, but it needs to have a decent audio system. If I'm okay with the standard system, can I expect nothing but improvement going with the JBL factory setup? Does the JBL setup have a dedicated subwoofer?