Other than running a simulation of the box and seeing the response, checking the SPL vs. Power (or xmax), and then taking into account placement in the room, and possible "room lift", there's no way to know for sure how low it will go.
Otoh, if you have enough sensitivity and the SPL vs. Power vs. Excursion part is favorable, you can do the EBS thing, which EQs the lower freqs and uses an enclosure that is somewhat smaller, and an amp that is somewhat larger.
High power amps for bass are pretty inexpensive today.
How low do you think you need or want to go, and how loud?
Anyway, NO.I have a pair of JBL 2215H in my basement, are they suited to subwoofer use?