so im having a little trouble figuring out how to figure out my port displacement. the box is 36w x 36d x 21h, so 13.4 before displacements minus the sub disp. it would be 12.9 after subs. I want to tune it to 33-34hz. I was going to do 266^2 in of port. If I type it into 12volt site I get the port has to be between 34 and 37 inches long
so how would I figure the port displacement?