I am trying to select hardware for an install in a 97 Jeep Cherokee which is a pretty bad acoustical environment plain and simple.

I think I am going with the Pioneer 80prs HU due to a couple reasons. It has an SD slot and USB ports. It also has a built in amp and since space is really tight due to a bunch of other accessories installed in this vehicle that is a big help. It also has Burr-Brown 24-bit D/A Converters, time alignment and a couple other nifty features at a decent price, $268 on Amazon.

I do not want to install a sub right away. So, I am looking for a warm 6.5" Coax speaker that has pretty good midbass (since I won't have a sub). This vehicle has a sound bar overhead in the rear of the vehicle that you can get 5.25" speakers in.

Since the rear soundbar is at the back of the vehicle should I install speakers in rear doors instead of using that sound bar? How about just installing in front doors and skipping any rear speakers?

I am looking at the Polk DB651's for the front and Polk DB521's for the rear. I hear however that these may not have enough midbass.

What other speaker might I consider keeping in mind I REALLY want a warm speaker and I need as much bass as I can get. I also want them to sound good at lower volumes, just not cranked up wide open all the time.

Thanks for your input.