Need help with Enclosure Design

[snb778 1]

Need a little help with box design. I tried out about 6-7 of them now and they all give me different numbers. I want to do a 6" Aero port (unless recommended otherwise). Any sites you guys know of where it takes displacement for the sub and port into consideration while calculating? I tried BCAE1.com,

 

Internal dimensions are 12.5x28.5x21.9 = 7801/1728= 4.5cu. ft. Their site is saying Gross volume = 4.2, which is already wrong, then -.32 for sub displacement and also need to subtract port displacement....?? RE's site doesnt allow aero port calculations.

[Tirefryr 1,742]

What drivers?  How many?  What tune?  How many vents?