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It's not intuitive and I still don't believe it :D, but for a passive radiator system the only parameter that seems to matter is the weight of the cone. You'll still need to find that but you can determine it experimentally by building a large box, installing the woofer and PR, and backing the weight out by determining the tuning frequency.

see http://www.diysubwoofers.org/prd/ for description on how to design a passive radiator system (and the eq's you'll need to find the mass of the PR).
 
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