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Unfortunately, I can only find German-language contributions that are all without 'depth' and therefore do not help me. I had assumed that the loudspeaker could be found in other countries under a different designation, hence the question.
It is clear that due to the wavelengths in the frequency range under consideration, the approximation of a horn contour is easier/less problematic than in the mid-range or high-frequency range. In my opinion, however, this only applies to the consideration of the amplitude curve over the frequency. The discontinuities definitely lead to reflections and these should be reflected in the transient and decay behaviour. I don't have the experience here to know how strong this is and whether the effort is worthwhile through - still discrete - but more continuous transitions between the segments.
Consider the size and behaviour of the frequencies involved here. A wavelength at 100 Hz is 3.4 meters, at 10.000 Hz it's 3.4 centimeters, so at 10 kHz your thumb is a considerable obstacle but at 100 Hz your entire arm isn't. Likewise, at 10 kHz this horn is a complete mess but at 100 Hz and below it isn't noteworthy. You might find a stepped segment response to have the same order of performance.
If the Extra Extended abandons the KISS principle to some extent, why not optimise this first segment further? The first 'channel' segment serves - if I have understood the explanations correctly - to extend the horn. Here, too, I have the feeling that the design creates an avoidable resonance that is reflected in the in/out vibration behaviour - but perhaps my gut feeling is simply deceiving me here...
Extended stands to lose the KISS-principle, 3 angled cuts instead of 1, no backward compatibility between Standard and Extended because of cut sheet differences and construction. All the while I don't think you'll simulate a significant difference let alone measure something. Feel free to try though.
I am not quite sure how you mean this. Probably you just meant that you wouldn't measure a difference between a cubo extra extended and a cubo extra extended with slightly different first panel.
Extended stands to lose the KISS-principle, 3 angled cuts instead of 1, no backward compatibility between Standard and Extended because of cut sheet differences and construction. All the while I don't think you'll simulate a significant difference let alone measure something.