What effect does a TL have on harmonic distortion?

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Looking at various measurements posted to the internet it seems like there is a very close relationship between a driver's fs and harmonic distortion. It appears to me that impedance around fs has a strong correlation with harmonic distortion. On some drivers this shows up as 2nd order harmonics, on others as 3rd.

Does the rising impedance cause the rise in harmonic distortion? If it does, will the impedance flattening at fs that can be achieved with a transmission line enclosure reduce harmonic distortion?

Dan
 
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