take it from somebody with literally a hundred hours of on hand experience with Jeep Cherokees, and Grand Cherokee
anything more than 2 15's, or 4 12's is a complete waste of time, money, and space...
the ONLY thing that works in those jeeps... is rearward firing..
and with rearward firing, with a box that isn't completely blocking the rear glass... 12 cuft max..
firing up, drops ya 2-4 db....
if you like diminished returns, and a lighter wallet.. do something silly like 8 15's firing however.... with as big a box you can cram in it....
its not about how many woofers you can cram into a vehicle... its how effectively you utilize the space..
I'd do 2 good 15" woofers, ported, in around 8-10 cuft, firing rearward, with 1kw-2kw of power... and build yourself a good electrical system... cause jeeps have a gay one from the factory...
Loyd L.