i need a little help building a spl box.
it going in a 2007 honda civic si.
subs are 2 dd 3500 12s dual 2 ohm g motors.
amp is american bass vfl500.1.
150 amp alt.
350 ah of batterys
max dim of trunk is 40" wide 20" high 24 3/4" deep
im trying to get close as i can to a 150db sealed legal
the current box is sealed off firing in with no back seat
double layer 3/4 birtch tuned to 55htz with 6.79cuft after port and sub dissplacment with 136sq in of port. 20 sq in per ft.
i tryed diffrent size 45s in diffrent coners diffrent port lenghts and sizes
the highest number i could get was 147.25db at 51 htz. clamping 3500watts.
if i can get any help it would be greatly appreciated.
here is a pic and the ts parmeters