Pioneer SUPER TUNER! Great feature, the first one I bought had a 8 track, but I could tune in the best LA stations like they were local!
The amp section on this is not going to cut it. Probably why it's so reasonably priced, given all the features.
It has RCA outputs, so buy a outboard amp that is at least 100 watts per channel. REMEMBER: the more amperage you can afford the better, and NOT for loud sound, but for control of the speakers.
So the 3" are kind of small to deliver mid range, and no bass.
I would add two 6" speakers to the kicks, and woofer behind the seat.
Using a 6x9 behind the seat kills all mid range and higsh freq's. If you leave them, the unintelligible noise will escape into the cab and really clash with the clean sound.
But If that's what you have (6x9), short of buying new, use a cross/over for those two that only passes bass and eliminates the rest.
I have seen some pretty good 6x9 corner boxes. Add sound deadener and insulation inside the box. That will keep the bass tight and not muddy.
This is my wheelhouse if you need more info. Sounds like fun!!