HELP sundown sd-2 10 measurement needed

[listow 10+ year member]

Im trying to build a downfiring box with this sub and very limited verticle space. What is the minimum space needed between the box and floor for this sub? Their website doesnt give the amount from reaserch the sub has about an inch of excursion so if i could get a measurement of how far the sub sticks out off the box that would work too i think

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