摘要：

An electro-acoustic transducer comprises an enclosure of closed form containing a plurality of piezo-electric motors, each connected to the enclosure to excite the same, the motors having no mechanical connection between one another capable of transmitting static or dynamic forces. The transducer has two acoustic frequency ranges which are independent of the value of the static pressure prevailing on the outside of the transducer, one frequency range being due to the resonance of the envelope, and the other to the resonance of the motors.

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