Ok my plan of attack , As of right now i have 4 12's witch is half a wall, its for a foor door car, I got one question for those who have build or helped on these builds. Will i have to deaden from the wall and foward or do i still have to deadedn the whole car ive got 4-5 layers on the roof ,(it wont flex). i just have that question also if i do have to deaden the whole car can i use spectrum on the other parts behind the wall?. thanks