Help with modifying improving a existing sub design.

[Hevychevyjeff 10+ year member]

Here it is

How do I figure out the cubic feet on this, it has to many angles I don't know how to do this. I can do a rectangle, but this?

I'd like to add slot ports, how do I figure that out on this box. 30-32 htz.

I'd like to maybe exit the subs, and ports at the top. I have enough room to add 3 inches to the top of the box also. I'm looking for 2 cubes per side 4 total if the depth has to come out thats fine.

The width has to stay the same, and I have 3 inches to play with on the height, and what ever on the front depth. the rear depth 3 inches could be added also.

As it is what's its cubic feet sealed ?

what size would the slots ports need to be?

Is there a formula to figure out port size to hz?

I'm looking to put 12's in there

any help would be greatly appreciated.

Thanks, Jeff

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[Hevychevyjeff 10+ year member]

they have slot ports drawn but no dimensions, or tuning info.