Confederate

I already have a PA system on my truck. but I am looking to make it louder, especially for beach parties and such. The one I have now is just hooked straight into the CB, with no power cords to run to the battery. This obviously means that it is powered directly from the CB, and no offense to the Uniden I've got but it just isn't that powerful. Does anyone make powered speakers to where it is more or less "internally amped"? I don't mind running a power wire to it if it needs it. To sum it up I am looking for something that is about as loud as possible.