terryforsythe
Major Contributor
Looking at the measurement, the harmonic distortion below 30 Hz predominantly is 2nd order (red line in the graph). So, for signals below 30 Hz the distortion content predominantly is below 60 Hz. Definitely not localizable as the wavelengths below 60 Hz are longer than 5.7 m.Looks to me like you have frequencies that distort to 1% below 30 Hz
Also, I'm not confident that all of the distortion indicated in the graph is from distortion of the subwoofer itself - the walls of the room, as well as things in the room, vibrate when the sub is playing low frequencies. Their noise is picked up by the microphone and probably reflected in the harmonic distortion measurement. Obviously, those noises will not be localized to the subwoofer.
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