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A magnetostatic loudspeaker is a dipole loudspeaker that is quite similar to electrostatic loudspeakers but instead of using high voltages it uses high currents. Permanent bar magnets provide a static magnetic field. Wires or strips carrying audio frequency currents are bonded to a thin diaphragm; movement of the diagphragm under the magnetic forces produced between conductors and permanent magnets creates sound.
Because of its dipole structure, this kind of speaker creates sound mostly to its front and back. The impedance of a magnetostatic speaker may be so low that amplifiers have to be ready to feed low impedance. Magnetostatic speakers provide good sound quality but their dimensions are large.
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