Natually, the printing pattern is similar, though the material is completely different.
To me, this material also 'looks' very suitable. Perhaps it's the same as shown before, but a different color.
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That just looks like rustoleum stone paint...
American Accents(R) Decorative Finishes Stone Spray Paint Product Page
It seems from the results gathered so far that the actual contribution of HOMs (inherent to a profile) will be generally very low, at least up to a rather high frequency. I'm more and more convinced that what is observed as "disruption of pressure field" is almost always caused by a suboptimal mouth termination. Take any shape of the Salmon horn family and make a smooth termination e.g. via a clothoid and I'm sure it will all behave virtually the same. That's the reason I said it is "nothing more" than a smoothly terminated exponential horn. Because in my view there's really nothing more to it. I still may be missing something, but then show me.
No stone sprays, please 🙂
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The intention was to be able to generate a horn profile given a defined isophase wavefront area expansion rate. Jean-Michel assumed a hyperbolic-exponential expansion, but it could just as easily been have something else (eg. conical, exponential, parabolic). It was a brilliant piece of work, freely shared, and arguably one of the very few genuine advances in acoustical horn design in the last fifty years.
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For one thing, a superior horn throat acoustical impedance characteristic loading the driver, due to the controlled expansion rate and the better impedance matching at the horn mouth resulting from the rollover inherent in the Le Cléac'h generated profile.
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When I asked about the intention, I of course was interested in this claim: "... but they clearly work as intended." Clearly I would like to understand what was the intention and what was verified. The smoothness of the polars? Is that it?
Frankly, I see absolutely nothing special about the acoustical impedace you show. Somewhat suboptimal, at best.
Frankly, I see absolutely nothing special about the acoustical impedace you show. Somewhat suboptimal, at best.
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Years ago I was a dealer in Auto-Tech horns. I have implemented all kinds of horns in my client systems. I can agree that JMLC horns have a very good phase curve, but express the beaming effect in the upper range. The stage effect is so strong that it sounds in your head. But it is impossible to listen for a long time, it is tiring. When I first tried SEOS waveguides, I was amazed at how tireless it sounds. The stage was no longer in my head, but in front of my eyes and the sound had become wider. Currently i am listening ATH calculated round waveguide and i can say it is the best performance.
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To my, albeit limited, knowledge, HOMs are (mainly) related to higher frequencies and as such a byproduct of sudden changes in the horn profile near the throat.
BTW, this was a 10-minute work with Ath including the BEM run. Should anyone want to explore this breakthrough technology, here's the script.
