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I had a number of discussions about ribbons loading into horns and I generally do not welcome this idea. There are a few reasons why it never work properly and one of the most convincing is that in order to develop enough output from a ribbon you need to have some ribbon radiation surface that usually larger then a desirable throat size for a proposed horn rate. If one need to EQ a few DB with horn with upper ¾ of the ribbon response then it is OK. However to make a fully functional horn for a ribbon is not fruitfully thing to do.  There are many other complications with no gain, so why to bother?

What however I very much object is a need to cure limited Ribbon’s vertical dispersion with horn – why would anybody need to do it? Second is the curving of throat. The throat curving is absolutely not necessary; in fact it is even ridicules. You can curve ribbon with DC but what the purpose of a curved ribbon if it sits behind a  virtual  back chamber (chamber is always there) of a horn, the back chamber that has no geometrical dimensions but only pressure dimensions? It feels that you did not experiment with speakers yourself. I do not know who you are and what you do but I wonder – are you just talk about speakers subject or you actually practice some kind of sound and some kind of objectionable playback?

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