You can do a lot to improve them. Jeeps have been around for many years and similar principles apply. A powered subwoofer will dramatically improve the bass. The drivers in factory installs (even "premium" systems are usually junk.depending on how often you plan on having your top down/back, spending money on improving audio could be a waste. You just can't get the same sound quality out of a jeep or bronco that you can out of a fixed roof vehicle, or even a much smaller convertible.