Excluding problems linked to geometries and materials, loudspeakers distortion produced at high signal amplitudes is mainly due to motor and suspensions system asymmetries. A novel metric is introduced to examine loudspeaker BL asymmetries that generate 2nd-order Inter Modulation Distortion and Harmonic Distortion. With the new metric is possible to recognize new type of asymmetries and their small differences, offering a measure of them, point-by-point or integrated in a specific region. Moreover, the used scale is an absolute quantity, making it valuable for comparing loudspeakers performances referred to general asymmetries, optimizing or selecting among various designs of the same loudspeaker. The practical application of this method is demonstrated examining a loudspeaker motor force factor BL(x), plotting and discussing asymmetries for different voice coil rest positions and XBL displacement.
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https://aes2.org/publications/elibrary-page/?id=22547
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