Been doing allot of reading about port area and such I have a prefab box at The moment that is about 1.78 cubes after displacement Tuned 35hz .65 mdf double baffle..did a 138 @37hz
Anyway the box I'm looking at buildings port is
3.25x12, 40" long giving me 2.38 after port.sub.bracing displacement. And 31hz tuning double baffle 3/4 mdf WxDxH 30x22x13.5 sub and port firing at trunk.
Before building would like some input make sure I'm not missing something.