I have setup a bunch of speakers and subs in my 01 xj, I have 4 8" 400w subs, and a 2600w mono amp, 2 farad capacitor, I have 2 6.5 in skar speakers in the rear and 2 5 1/4s in the rear doors and 2 in the front doors and 4, 1 inch tweeters in the dash, and 2, 4 inch speakers in the center console with a 1000w boss 4 channel amp, they are all wiring in parallel so they run at 2ohm at 188w rms per channel. I'll upload some pictures of the setup when I get home, stock alternator. It's crazy loud. If anyone has any questions let me know. Let's see your setups!

 

I have 4 6 1/2" speakers with a 400w amp and 1 sub 10" with a 1000w amp that is built in to the rear .

 

The 4"
Tweeters
" />4 8" subs

 

I always wanted to put a small sub under one of the seats . I like that idea of it in the back built in