Yes... the stock amp/speakers suuuuuck hard.
Replace them with whatever. You have RCA pre-amps on your head unit so its an easy connection. New 4ohm speakers for the sound bar (coax) and 4ohm components for the front. New sub that can take some power and new amp(s) to match.
There are quite a few smaller amps that fit under the steering wheel like the stock one does. Its actually got quite a bit of room in there. Or you can look to mount them in the glove box or behind it. Some folks mount them under the seats as well.
'12 JK COD:MW3 Edition
'10 WK, Black(sold)
Colorado Jeep Club member #217