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Motional Voltage as a Distortion Mechanism in Loudspeakers

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An alternate model of the loudspeaker/amplifier system suggests a reason to prefer amplifiers with damping factors near unity. This analysis revolves around the motional voltage or back EMF generated by moving-coil loudspeakers. This model and some examples are presented and examined. A circuit which uses motional voltage feedback to synthesize a damping factor of unity is presented. While listening tests tend to show a preference for systems with unity damping, little support for this observation appears in the usual battery of tests. Analysis of these and other tests point to a combination of factors that makes low damping factors desirable.

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AES - Audio Engineering Society