I bought the VDP sound bar with 6 speakers. They have built in crossover's. I currently do not run an amp and have a old radio (5w). I can still blast the sound so as I can hear it on the highway at 65mph (no top/doors). I plan to get a newer stereo that has about 20w output. If I get an amp, I would put mine in the locking center console (where the stereo will go). The bar has all the wiring in place, just have to hook up the rear speaker wires (that hide in the rollbar padding).
Also the VDP sound bar I got has two dome lights that are reasonable.