Looking at prices for oem audio parts online, these are what I found:
4 door - $150.65
2 door - $236.90
Do 2 door models have different/better amplifier?
w/infinity - $26.51
w/o infinity - $7.99
w/infinity - $7.99
w/o infinity - $26.51
Looks like the jeep with or without infinity system have same speakers, but better speakers are installed in rear for jeeps w/o infinity. This might be misprint, but all of the websites I checked are listed this way.
People who don't have infinity system, do your rear speakers volume is a lot lower than the front speakers like infinity system?