Havoc 18 recommended box sizes ?

[Dice 0]

Hi all do ascendent audio have any measurements for a recommended ported box for there subs ? I have two 18" havocs an want them in one ported box .

[BKOLFO4 29]

I would shoot for 12-13 cuft net with 160-200 sqin of port tuned to 32-33 Hz.

[Dice 0]

Cool do you know the rough out side dimensions for this size box ? I'm confussed with port sizes