Permanent rare-earth magnet assembly for a loudspeaker

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The assembly comprises a core body 10 with a plurality of sides and a projecting pole piece 18, a plurality of permanent rare-earth magnets 22, 24, 26, 28 each having a flat inner side of like polarity abutting against a different face of the core body, a front member 38 of magnetically-susceptible material having a hole into which the pole piece extends, defining an air gap, and one or more outer elements 30, 32, 34, 36 of magnetically-susceptible material which contact both the outer sides of the magnets and the front member to complete a magnetic circuit that includes the air gap. A cover 42 can be attached to the front member, enclosing the diaphragm. A compression driver loudspeaker, incorporating this permanent magnet assembly is disclosed. A number of such compression driver loudspeakers can then be arranged in a line array. Employing a box magnet arrangement with rare-earth magnets, a small-diameter permanent magnet assembly suitable for a compression driver can be produced.