Distortion in loudspeakers is shown to be nearly proportional to power output. Typically a plot of log distortion versus dB output shows a 1:1 relation. In one sample ooudspeaker the slope of the distortion versus output curve was in excess of 45 degrees. Comparison is shown between a direct radiator of 20-cm (8-in) diameter, one of 30-cm (12-in) diameter, and a high-efficiencØ horn of 0.45 m/3 (16 ft/3). At 95-dB sound pressure level output measured at 61 cm (2 ft) the 12-cm cone showed 18% (-15 dB ref 100%), the 30-cm cone showed 6% (-25 dB ref 100%), and the horn showed 0.8% (-42 dB ref 100%). Each curve of distortion versus output shows a slope of at least 45 degrees.
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https://aes2.org/publications/elibrary-page/?id=2018
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