that box size using 3/4 inch mdf would yield 11.5 cu or 328 ltr. What driver do you have? The dual 2ohm or the dual 4? The vas are different between them. You can download for free, winisd and model it for yourself, if your interested in learning the process. Basicly enter the fs, qts, and vas of the driver, and it will get you ballpark figures for box size and ports ect.