As you read in the title and description I'm getting a Fi Car audio BL 15 and just need suggestions on what options I should get and dimensions on a box that I should build. I've got a 1994 extended cab F-150 and in the back have appx. 18x24 for the base of the box and wanted to know how tall I should make the box and how big I should make the port to tune it to 32 Hz.