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[spl dbmin=80&dbmax=110]J210F12,DR250,O12[/spl]
This chart represents the O12 with a Delta12LF. If I'm not mistaken, with the 3012LF or dual BP102s, the O12 is about 6dbs hotter in the low end. If so, that would put it about neck and neck with the Jack 2x10 from 70-100hz, but the O12 would kick Jack's ass from 40-70hz. In either configuration, the driver(s) would have greater Vd than the Jack's drivers, so max possible output wins, too.
If the Jack 2x10 is about the same size and weight as two Jack 1x10s (size not given on the sales page), then the O12 is less than a half a cubic foot larger than the Jack 2x10, and weighs about the same.
The obvious advantage to the Jack design (compared to an O12) is that two Jack 1x10s would give you small, lightweight cabs, with the ability to use either one or both cabs. For a bass player deciding between an O12 and a pair of Jacks (no poker pun intended) , another advantage is that a pair of Jacks can also be used for a small PA, with or without subs.
I don't think it's been brought-up yet, but the Jack design is absolutely brilliant in the fact that it's sensitivity and frequency range rivals that of a lot of 1x15/horn commercial cabs. Granted, a 2510 doesn't have the Vd of most 15s, but Bill's managed to coax a little 10" driver into producing amazing bass, while also providing very good overall freq response, in a cabinet that's a fraction of the size and weight of it's "competition". Bill, you really out-did yourself with this one!