I know the same question is asked over an over but i have searched and i am still really not sure how to tune my box. I just built a box that is 36-18-15.5. and its made of 3/4 mdf. So i get a volume of 4.61 cu ft. The subs are 2 12' audiobahn 1206t's. But what really need to know is how big to make the port to tune it at about 32hz. If my port is 14 inches tall and 4 inches wide how long does it need to be to be tuned at 32hz. Thanks for the help.