Abstract
An electro-acoustic transducer has a diaphragm which comprises a layer of a polymethacrylimide foam having a modulus of elasticity between 15×10 6 and 120×10 6 N/m 2 and a density between 10 and 80 kg/m 3 . If the diaphragm has a sandwich construction, the core layer is made of said polymethacrylimide foam and the skin layers are made of glass fibres, carbon fibres, cellulose fibres or polyaramide fibres. This results in a transducer having a higher efficiency and a lower distortion.
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