Confused regarding Harbeth speakers and sensitivity
Bill is referring to Doppler distortion.
If you have a loudspeaker driver reproducing a high frequency tone at the same time as the cone is moving in and out to accommodate a low frequency tone, the pitch of the high tone increases as the cone moves toward the listener with the bass note, and then falls as the cone moves away from the listener.
The level of modulation of the high frequency tone is proportional to the excursion of the cone as it reproduces the low frequency tone.
This generates a form of intermodulation distortion where the high frequency tone is modulated by the low frequency tone.
The result is a set of sidebands around the high frequency tone displaced by +/- the frequency of the low tone.
Loudspeakers drivers with smaller cones are more impacted as they need larger excursions to produce the same audio output as a larger loudspeaker driver. Doppler distortion is proportional to the square of the decrease in cone diameter.
Tom
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