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Magnet-only loudspeaker motors: linear behavior theory vs. Nonlinear measurements

Abstract : A few years ago, a new concept of magnet-only loudspeaker has been proposed to improve the quality of the reproduced sound. Such a loudspeaker is called magnet-only because its magnetic circuit is totally made of rare-earth permanent magnets. Unlike the classical electrodynamic loudspeaker, no iron is used. According to the theory, the exclusive use of permanent magnets and the absence of iron can lead to a uniform motor parameters (force factor Bl, resistance Re and inductance Le) over the voice-coil displacement and thus to a decrease of the nonlinear distortion and to an improvement of the sound quality. To our knowledge, such motor parameters have not been consistently quantified, neither their variations. In this paper, the variation of the parameters of a magnet-only loudspeaker are measured. The goal is to verify the theory and to show that using a simple measurement procedure one can understand better why a magnet-only loudspeaker improves the quality of the reproduced sound.
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Submitted on : Monday, April 23, 2012 - 10:00:00 AM
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Antonin Novak, Benoît Merit. Magnet-only loudspeaker motors: linear behavior theory vs. Nonlinear measurements. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00811093⟩

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