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Not sure about what JBL setup you're talking about, but by dual woofers, I'm assuming you mean two drivers, one placed vertically over the other, with a tweeter in between. That is called the MTM arrangement (midrange - tweeter - midrange). In that arrangement, both midrange/woofers are active and crossover design is critical to it sounding correct. THX theatre systems are mostly by JBL and are like this.
There is also a type of design with a active woofer, and passive radiator, but such a design is more complicated and requires you to tune the mass of the passive driver to the ideal resonant frequency of the woofer/cabinet design that will provide you a flat frequency response. The Loudspeaker Design Cookbook will give you more detail about calculating such a design.
Last edited by Steve W; 05-06-2006 at 12:56 AM..
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