Acoustics: Sound Fields, Transducers and Vibration, 2nd Edition

Part XXXXI: Induction loudspeakers

14.19. Radiation from a circular plate in an infinite baffle—model of an induction loudspeaker coupled to its surrounding air [13,14]

So far, we have analyzed membrane and shell type loudspeaker diaphragms but only looked briefly at plates to calculate their mode frequencies with various boundary conditions. With the shell, we followed the traditional approach of using curvature, together with the material properties, to maximize the stiffness and thus raise the eigenfrequencies as high as possible. This in turn made the pressure response relatively flat until the first break-up frequencies occurred, above which it became highly irregular. The ideal material has a high ratio of Young's modulus to density. ...