US Patent 9282409 Bass shaker transducer

A bass shaker system is provided that includes a motor and a motor housing, where the motor includes a motor case having first and second members shaped to tightly envelop an exterior surface of the voice coil while still leaving a gap between adjacent ends of the first and second members, and a plurality of spiders having at least four spider legs secured within a ring that has an interior shoulder to mate with a radial ridge on each of the first and second motor case members. In some embodiments, the bass shaker system includes ventilated caps and vented housing covers.