Passive Radiator Airspace

[gatorgrizz27 10+ year member]

I have a boston G-510 (10") subwoofer, and am planning to add either 1 12" passive radiator, or 2 10" ones. The problem is, boston's specs for the boxes only show it with 1 10". They reccommend 0.5 cubic feet with a passive, radiator, which is the same size they call for on a sealed box. How do I determine the airspace size for 2 passives or a 12"? I have read everything on this site, and all the links, but they basically just explain how they work, not box sizing. Thanks.

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