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Article Dans Une Revue Journal of the Audio Engineering Society Année : 2015

Magnet-Only Loudspeaker Magnetic Circuits: A Solution for Significantly Lower Current Distortion

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Benoît Merit
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Résumé

This paper presents a study case which leads to a significant decrease of current distortion caused by the magnetic circuit of the loudspeaker: the solution consists in removing all of the nonlinear soft-iron pieces that are used in traditional loudspeaker motors. Thus, in the loudspeaker motors we study, the static magnetic field is only created thanks to a combination of permanent magnets. This combination leads to the realization of the so-called magnet-only loudspeakers. Two loudspeakers are compared in the study: the first sample is a mass-produced 6.5 inch loudspeaker. The second sample is built replacing the magnetic circuit of the first loudspeaker by the magnet-only structure. Thus, the moving part, including the voice-coil, the diaphragm and the suspensions, is kept identical for both samples, leading to a comparison of both loudspeakers only based on their motor. The loudspeaker with the magnet-only motor shows significantly lower current distortion than the original loudspeaker. A possible explanation of such a decrease of distortion is given, based on results of a set of measurements with blocked voice-coil.
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Dates et versions

hal-02504314 , version 1 (10-03-2020)

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Benoît Merit, Antonin Novak. Magnet-Only Loudspeaker Magnetic Circuits: A Solution for Significantly Lower Current Distortion. Journal of the Audio Engineering Society, 2015, 63, pp.463-474. ⟨10.17743/jaes.2015.0051⟩. ⟨hal-02504314⟩
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