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be wrote:

They mention an intricate back chamber for the high frequency unit, maybe thats the primary function of the tube, apart from positioning the unit relative to the rest.

I did not read any their descriptions and I do not know what they use. If they use an “intricate back chamber” then the most likely they use a non-compression driver for HF. There is nothing wrong with use of non-compression drivers if they used properly. I wonder what they do in there. It looks like the HF throat is relatively large, probably 1-2 inch and the HF horn is relatively large. Way they need so much LF EQ form the horn for HF channel I do not know and I also do not know why they need that “intricate back chamber” for HF. Any “intricacy” around the HF cone handling usually takes place within a very short distance form the diaphragms, usually within a few millimeters.  It looks like they have a 3 feet of pipe behind the HF diaphragm…. They say that they “loaded” it with some kind of function. Perhaps they successfully implemented on their tweeters my old crazy idea of damping the diaphragm by use of “active” back chamber? (I used another back-phased EQed driver as a back wall of my back chamber for my upperbass) It did not work for me, at lest at the level of my very primitive implementation but they might succeed by doing it better? I wouldn’t do it for HF anyhow and also, still for HF it would be a mater of fraction of inch…

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