I kept it fairly simple, a Kenwood mp5028 head unit, it looks right at home in the dash and had the highest output of the major makers from the built in amp.
Front doors and boxes in the back house 6 1/2 and 6 3/4 respectivily Blaupunkt components, tweeters mounted at the lower front corner of the woofers in the front doors and to be mounted on the shoulder belt punchouts in the rear. they came from Crutchfield on clearance, plastic cones. I figured I'd try something different, nice sound and worth the $$$ on sale, but not sure I'd buy them again, I'll spend more time with the sub on and decide, the frequency range may just not be intended for a system without a sub. I used styrafoam cups behind the door speakers to keep the water out
A bazooka bt8200 sub sits behind the rear seat
from recolection it is a single 8" cone with a built in 200w internal amp, I love the simplicity! I didn't want to need to build a box, this tube only impedes the last click on the seat slider, but even with the front seat all the way back I could fit 3 NBA players back there
it isn't a chebbie
, hits nice 'n hard if I turn it up
but I usually just use it for fill in.