Including Port Displacement?

[gsuchyta 10+ year member]

I'm building a box for some old 12" baja subwoofers and the manual says 2 cubic feet including port and sub displacement. Does this mean 2 cubic feet not counting the sub displacement and port displacement - like the box will be about 2.5 cubic feet total with sub and port displacement.

Or does it mean 2 cubic feet total and the sub is seeing like 1.75 cubes I'm confused and I know this is probably a stupid question.

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[Ray21 10+ year member]

2 cubes net.