Im trying to make my box look like the first one, so how many common port walls would I type in? And if i cut the peices with the cutouts the calculator gave me wouldnt they not fit together right? If I dont have enough port area what does that mean, my sub is not getting enough air? Im trying to squeeze this box in my small trunk hah. Thanks for the feedback though i didnt think anyone was going to get a sketch that fast let alone 3