Just wondering if one can use one of those 1" thick styrofoam shipping boxes used to ship meat for a test box when calculating Vas or do you need a rigid wood or mdf box?
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Well, for a reliable measurement of the stiffness of an air volume as seen by a piston at rather low frequencies (well under resonant frequencies of enclosure panels), one needs a relatively stiff enclosure. Or a reliable compensation for the flexibility of it. As I see it, sandwiched foam would be good here. But on meat boxes: I’d put one to the test. E.g. compare it to a mass-added method of estimating Vas.
I try to figure out how to do that with a laser. I think you refer to an interferometer? You could measure the suspension stiffness statically too, by measuring the excursion under a given static force. A slide gauge would suffice with an excursion of about 5mm. And an assumption about effective cone area, mostly by counting in half the width of the surrounding.