This paper points out the importance of mechanical and acoustical crossovers in loudspeaker systems. It discusses the role of diaphragm shape and material in controlling the mechanical crossover characteristics. The principles set forth are applied to an analysis of the behavior of a typical commercial dual-diaphragm type loudspeaker, in which mechanical separation of low and high frequencies is obtained by the use of apex-mounted diffuser-type radiating elements. Frequency response curves were taken for conical and curvillinear diaphragms in which the compliances at the apex were modified, and the effect of the auxiliary diaphragm was observed. Graphs illustrating these results are presented.
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