the critique of the jbl premium system has been widely documented here. i really hate how the soundstage is so far forward. i plan to keep the head unit and speakers in the dash so i was wondering if there is a way to replace all the speakers in the front and rear doors (especially the woofers in the front doors with something full range) and install a small amp to power them. i understand that the head unit is programmed in such a way to keep most of the sound up front so i wasn't sure if it would be difficult to get the full range signal to the front and rear doors. i was also concerned about the size of the amp. i don't want to compromise the performance of the battery and the mileage i'm getting. thanks in advance for any replies. *edit* also wanted to ask if anyone has a stereo shop they can recommend in the los angeles area, i'd gladly take the reco.