This is my plans for a bandpass enclosure for a 15" crossfire bmf the sealed portion is 2 cu ft. and the ported part is 3.3 cu ft but i dont know how to figure out the port. the sub calls for a 2 cu ft. sealed enclosure and a 3.15 cu ft ported enclosure. so i figured taking out the port and supports on the ported side it would even out to about 3.15 cu ft. Im using 3/4 in mdf. I dont know whether i want to do a port going into the cabin or facing the cabin or facing the trunk. Im thinking about doing it into the cabin and doing an amp rack behind it. its going into a ford zx2. I dont know how to figure out the size of the port. I was thinkin either using a side for length but I might do cylinder ports into the cabin. Which would sound better square ports or cylinder ports?? Im going for SQ and not so much spl. I was thinking of tuning the box to 30 hz.
any help appreciated.
P.S. anyone know of any good box building programs?? Im still using the old school pen, paper, and math skills.