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I love not only the beautiful results you are getting, Jessie, but also appreciate that the methods you are adopting allow you to continue to refine your horns on the fly.  Particularly nice, to my way of thinking, is that you can tune your horns by adding or removing material, which is hardly a viable option with the more usual choices for construction materials; not to mention the fact that reinforced plaster is DEAD, apart from its surface, which can yet be sealed, shellacked, doped, etc., to taste.  It is amazing how little is required +/- to make audible changes.  Of course, the horns could be made over a mold, which could be made of foam, for that matter, with the control curve plotted/traced onto a piece of sheet metal or even heavy paper.  Both "sides" of the curve plot could be used, one for the mold and one to check/control the profile during interior finishing.

As for the resonant/injection channel, I would recommend a 10" unit with a paper diaphragm.  This will be "fast" enough for the use, I would guess, and the 10" just has so much more to offer in the way of "color" in the mids/lower-mids.  I happen to use an 8" driver at the heart of my own rig, so I am not selling anything with prejudice.  It's just that I am pretty sure you will find a 10" better suited, if you shop and compare, for this application. If you run it with EQ/dedicated amplification, then maybe an old Fulton 100?  Might be too low efficiency, but, oh, the palette!

Anyway, thanks for sharing, Jessie.  This is as much fun as I've had with someone else's toys in quite a while!

Best regards,
Paul S

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