all right this maybe a lot to ask i would appreciate any help. i was converting a box from 2 12's sealed to 1 12 ported and screwed up the box so i'm starting over. i'm gonna build a box with a slot port tuned to 29 hz. for my idmax 12. my demensions are 33" wide 14" tall and 14" deep. i might be able to go a little deeper but not much. what i really want to know is how big to make the port. if anyone can come with like a drawing or diagram that would be great.