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be wrote:

There is no analogy to chromatic aberration in acoustics of air.

Disagree. Regardless the reason for Chromatic Aberration in context of the given illustration we care ONLY about the arrival time. In case of lens we have the discrepancy of arrival time as a deviation of focusing distance. In case of speakers we pay the penalties of misalignment. Do not forget that when we are talking about crossover aliment we are talking about the arrival of a single wave at the middle of the cut off. Let say that we have 10K cut off and use 10K sinus.  What would happen what we use 7K signal or 13K signal? In case of parallel horns we have no discrepancies and 7K, 10K and 13K will require the same alignment. However, with none- parallel horns you can get a perfect alignment only for a single frequency. In the case of Chromatic Aberration it will be the alignment for a single distance. The speed, distance and time are the very same subjects and in that I see a lot of similarities between optics and sound. With all that said I would like to remind that the “Chromatic Aberration Syndrome” as an explanation for sonic problem of non-parallel horns is juts my working hypnosis. I do not insist that it is so. As I said before I have no definitive enlightenment about the true reasons. The subjective evaluations that I did 7 year ago did indicate that the non-parallel horns are a big taboo. I never care seriously look deeper into the reasons. I feel that Chromatic Aberration is adequate enough explanation to satisfy my interest on the subject.

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