Please help with calculations

[bbbblaah 10+ year member]

I've been searching to find this but I can't figure it out. When calculating vent length, what do you use for Vb in the formula? The displacement with or without port displacement? If with, how do you know what to use for port displacement if you don't know the length?

Or do you use the displacement that you want?

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[dappa5 10+ year member]

you use a good enclosure program thats accounts for port displacement lol

bassboxpro v6 for examlpe

shoot me what you got in a pm and i'll figure out all you #'s