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Yes, any woofer can be used in an isobaric configuration. They must be wired so that the cones move in the same direction, which means you must wire them out of phase. This can be done in series or parallel, depending on which kind of load your amp prefers. Do parallel if at all possible. I have tried both the 'clamshell' mounting, where the woofers cones are facing each other, and the opposite, with the magnets facing each other, both with great results. The clamshell method can make for a slightly smaller box, but only very slightly, as either way you are still looking at the depth of two woofers stacked together. The clamshell method would be nice if you have a fancy cast frame woofer motor that you'd like to display.
If you were to wire it such that the cones were going toward each other, they would cancel out and you'd get very little sound. I've never gotten too deep into the whys of isobaric, but I do know that it works and works well, at least when configured in push-pull as I have described above.
Aaron Gilbert
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