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Doppler shifts in loudspeaker. Fact or fiction?

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This figure show the spectrual analysis of the acoustic output of a 5" driver driven by a 100 Hz input signal. Note that there are no other frequency components present that are greater than 35 dB below the input signal.

This figure show the spectrual analysis of the acoustic output of a 5" driver driven by a 1000 Hz input signal. Again, note that there are no other frequency components present that are greater than 35 dB below the input signal.

This figure show the spectrual analysis of the acoustic output of a 5" driver driven by a combination of a 100 Hz and a  1000 Hz input signal at the same level. Once again, note that there are no other frequency components present that are greater than 35 dB below the input signal.

This figure show the spectrual analysis of the acoustic output of a 5" driver driven by a combination of a 100 Hz and a  1000 Hz input signal at the same level. In this case the signal level was increased untill distortion componens appeared in the result. The distortion components are at 900 and 1100 Hz as would be expected form the analysis presented in the paper. The sidebands are approximately 40dB below thw fundamental which would be consistent with a 1mm driver excursion at 100 Hz.