I did not see any quick answers via search, and I'm doing the math prior to building a sub box based on a 2245h from the 1983 article. I'm making sure ti build the box and get EXACTly 12 cu ft in it--> tuned to 25HZ (modeled in WinISD).

When calculating the box volume to achieve exactly 12 ft3, do I subtract the volume of the port; i.e. make the box slightly larger to account for that volume (or more likely adjust the cutout size of the baffle--> top achieve the correct final volume)??

I suppose I need to approximate the volume of the 2245H as well, which I can rough out by doing a little geometry, so that the volume of the 2245H cone penetration's into the box is accounted for as well.

Thanks in advance.
Larry