hi, i'm new to these boards. i recently purchased a 98 LS400. The car came with a kenwood excelon dvd player already installed. all the speakers work fine, except i noticed that the stock sub was not working. i was wondering if this is a common thing where you lose your stock sub w/ an aftermarket deck/dvd player? I'd like to find out exactly what's going on except im scared to start ripping the car apart already. thanks.