Radiation characteristics of a concept loudspeaker are calculated both analytically and using finite element analysis. It comprises two closely spaced stretched piezoelectric membranes pushed apart by a pressurized gas. A drive voltage applied across conductive coatings on both membranes causes their tensions to vary in opposite phase and consequently the membranes are displaced in the same direction. Driven by a class D amplifier, this transducer potentially offers higher efficiency than conventional moving coil technology but with the smooth response and light weight of electrostatic devices. However, the voltage requirement is lower and the potential SPL higher than the latter. The only remaining question is whether it can be manufactured economically.
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