I used the Re Box Calculator to make a box for a xxx12. I've made boxes before, but none with the L-port yet. When I finished with RE calculator the port width was 4 inches and the calculator says it's tuned to 33.6hz. The back part of the L-port will only leave a 2 inch opening and the whole L-port is 4 inches wide. It seems like that 2 inch opening at the back of the L and the Box Right Plate is not big enough? Will that cause any port noise? I'm talking about the opening right behind the sub where the air first starts to come out to enter the 4 inch L shape port. I also thought the xxx12 would need a bigger box?