The magnetic field in the air gap of a conventional loudspeaker motor is most often an asymmetric nonlinear function of axial position. Placement of the voice-coil into this asymmetrical field yields an asymmetric nonlinear force-factor, Bl, which is a primary cause of amplitude modulation distortion in loudspeakers. Adjustment of the rest position of the voice-coil in this field can alter the nature of this modulation distortion. Common practice is to nominally set the voice-coil at the geometric center of the gap or at the position generating maximum Bl. A time-domain nonlinear simulator has been used to investigate effects of voice-coil placement in an asymmetric flux field on amplitude modulation distortion.
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