Conventional subwoofers are usually quite deep to accommodate long throw. A shallow subwoofer (SSW) design is presented which aims to maintain the quality of low distortion and long throw bass reproduction. Two design concepts, applicable to larger drivers, are described and results are shown. The result is more bass for a given speaker-depth without compromising the sound quality at low frequencies. One such concept is the sandwich cone, another the strut supported cone. The chosen design of a low profile diaphragm with strut support, is described in detail. Another issue is the motor and spider design. Considerations for joint motor and spider design are analyzed for a series of configurations. Advantages and disadvantages of each are described. The chosen design integrates the spider into the motor system to preserve space but still allows for a large diameter spider to be applied.
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https://aes2.org/publications/elibrary-page/?id=13778
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