Sounds like a new type of bending wave loudspeaker.
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five centimetres square.......................
The wavelength and range of frequency a driver can generate is typically restricted by it's size. Which is why tweeters (high notes) are small and woofers (deep notes) are large.
Not sure how they claim to get around certain laws of physics here.
The copyright on the original article goes back to the year 2000.
Acoustical performance of an electrostrictive polymer film loudspeaker | Browse - Journal of the Acoustical Society of America
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2000 Acoustical Society of America.
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Some diagrams and photos in this PDF link:
http://murphylibrary.uwlax.edu/digital/journals/JASA/JASA2000/pdfs/vol_107/iss_2/833_1.pdf
Little round things, should have known they would not be square.