I cant decide on the kicker 12" L7 with the kicker zx750.1 amp or a kicker 15" L7 with the Kicker zx1000.1 amp. My main question is which will be louder out of the two setups. Also If i were to get the 15" it would be in a 4 cu. ft. box and the 12" will be in a 1.7