Some radiation characteristics of circular stretched vibrating membranes are calculated. The calculations include the fluid loading effects of air, which are of essential influence on the membrane`s vibrational behavior in the frequency range around ka=1. Results are presented to show that the sound radiation of the most prominent representative of stretched-membrane loudspeakers, namely, the electrostatic push-pull loudspeaker, may be predicted very accurately. The full numerical procedure is supplied in the Appendix.
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