Traditionally, drive-unit related distortion figures are evaluated “on-axis.” This method leads to straightforward results as long as the frequency of the analyzed distortion component stays below the driver’s modal break-up region. When the distortion component is entering the drive-unit’s break-up region an on-axis based distortion analysis approach can become difficult if not meaningless. Therefore an alternative method is proposed which makes use of acoustic harmonic distortion sound power values, instead of sound pressure levels acquired in a single observation point (on-axis). These acoustic power values are derived from high resolution directivity data for the fundamental-, 2nd- and 3rd-harmonic-distortion components. Results are shown for different kinds of drive-units and the implications are discussed.
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