this is going by the RE L port calculator and im trying to figure out what exactly it will be at after i displace an audioque hdc3 15 and a double baffle, and about 2 wooden dowels for internal cross bracing.. 31.75 width, 20 height, 21 depth, 4 inch wide port, and for the port length 2, 8in. it says i have 74 sq in of port area which should be plenty and the total port length is 31. i was shooting for around 4.5 cubes NET around 35 hz. please and thanks!