The primary purpose of Isobarik bass loading is to achieve deeper bass response in a smaller than ideal cabinet by isolating the radiating woofer from the air "spring" in the box by a second driven woofer mounted in a sealed chamber behind it. This can be effective, but there are a few concerns. First, the woofers must be well matched. Next, the parallel connection requires an amp that can drive a low impedance load, or you must use a pair of higher impedance(16ohm) drivers. Third, you still must use a box size that will not significantly impair the cone movement of the rear driver. The drivers must be wired in-phase. This method has been used to good effect in the Linn Isobarik line of loudspeakers. More info is available on the Speakerasylum web forum.
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