Since the 1990s, Distributed Mode Loudspeaker (DML) has been widely researched and developed. The DML can provide wideband-characteristics and wide directivity in spite of a single diaphragm by using bending waves based vibration on the plate for acoustic radiation. This property is signi?cantly different from traditional loud-speakers. However, the DML has structural problems (e.g., maximum dimension becomes large), because it uses a two-dimensionally spread ?at plate. In this paper, the authors examine the characteristics of shell-structured loudspeakers whose diaphragm is formed with an arbitrary curvature, and compare them with conventional DML. Our results strongly suggest that the problems of the DML using a ?at plate can be improved by employing a shell structure for the diaphragm.
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