acoustic foam and Box volume

[mcmahon48]

Does adding acoustic foam effect box volume ?

 

[PeteMcK]

yes.
Unibox will let you model different levels of stuffing

 

[infinia]

In reasonable amounts ...To a lesser degree than fibre glass or even dacron.
Unibox will model this in as a percent that you may or may not varify the result amongst the many other variables.

But... you could also measure the effect on resonance/impedance if so inclined.