This air coupled woofer is designed for low frequency sound reproduction with high efficiency. The woofer was developed by applying a new analytic design which is CAD (Computer Aided Design) based. We made use of a built-in acoustic filter employing an air spring mechanism that is cleverly installed between the voice coil and the diaphragm. It is similar to, but a more advanced application of the Kelton concept loudspeaker. Calculations of the characteristic parameters agree closely with the measured results.
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