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Constant Component of the Loudspeaker Diaphragm Displacement Caused by Non-Linearities

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The independent of time component of displacement appears, apart from increase of even harmonics, if the most significant nonlinear characteristics of loudspeaker i.e. nonlinear stiffness of suspensions and nonhomogeneous magnetic field in the gap are nonsymmetrical in relation to the rest position of the diaphragm and voice coil. In some conditions, the value of this displacement can be so large, that the normal action of the loudspeaker will be disturbed. In the paper, the phenomenon is studied both theoretically and experimentally. It is proven that dependence of the constant component of frequency of modulation is different in the case of nonsymmetrical stiffness of suspension than in the case of unhomogenous magnetic field in the gap. This fact can be used to identify the reason for the appearance of constant component, its minimization and decreasing of harmonic content.

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