FIELD: acoustics.
SUBSTANCE: invention relates to acoustics. Vibration generating means in accordance with the electric input signal, which comprises a first permanent magnet means, comprising a first permanent magnet, a frame comprising a magnetic material, a second permanent magnet located between the first permanent magnet and the frame to be coupled with the frame, wherein one or more parts of the frame extend in at least one direction over the edge region of the second permanent magnet, wherein the second permanent magnet is also arranged facing the first permanent magnet at a distance from it such that the magnetic interaction between the first permanent magnet and the second permanent magnet applies a first force to the surface of the device, wherein the frame is magnetizable by a second permanent magnet to create a magnetic interaction between said one or more parts of the frame and the first permanent magnet means to apply second force to said surface, having opposite direction compared to first force.
EFFECT: high sound quality.
15 cl, 21 dwg
