any input appreciated, first aero port box

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im building a box for 2 sa12's for my wagon, subs up ports back sounds best with the single I have in now. I want to use aero ports, and I never have before, can any1 tell me if my math is close or not?

I plan on 4 cubic feet after the speaker and port displacement...

.75 mdf

box width-32"

box hight-14"

box depth-22"

sundown says displacement is .14ft3 x 2

I calculated the port displacement as volume of a cylinder, I got .09 cubic feet x 2

I plan on using 2, 4" aero ports 12" long, will that get me around 33-32 hertz?

any help appreciated, thanks

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