I still don't know how to isolate those in a clear way but to me the latest results indicate that the cross-sectional shape (per se) is basically irrelevant in the end. If at all, it will probably be a (very) HF stuff - hard to simulate accurately anyway.I bet non-parallel walls has a positive impact on HOM dampening.
By reflecting the wave "away" and make it meet other sized geometries, non parallel walls has a dampening/scattering effect making energy distributed rather than concentrated -> lower Qs in effect. No?
When you say diffraction above, you don't mean from the mouth I suppose?
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When you say diffraction above, you don't mean from the mouth I suppose?
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A horn is driven at the throat and the sound wave develops from there. So a rectangular horn is less "coherent" (i.e. with diffraction less concentrated in time and space) than a round one or a 7-sided one (the more sides, the closer it is to a circle, i.e. the more symmetric/coherent it is). That's the situation as I see it.
And because the simulations show that both rectangles and circles can give perfectly smooth results, I really don't see this as an issue. What's crutial is the profile and how it's terminated - that seems to make all the difference.
And because the simulations show that both rectangles and circles can give perfectly smooth results, I really don't see this as an issue. What's crutial is the profile and how it's terminated - that seems to make all the difference.
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Lol. As it turns out I just folded a rectangle, once. The far-reaching implications should be obviousOK but that dont look like it could be a part of any "some"-agon?
Again, the worst should be a round horn in this regard. And the fact is that is not problematic at all - if done right. How could be worse something that's less symmetric?but HOMs is an energy that "appears" in the other direction - right?
Could be
Four sides are already quite good though, even without a mouth folding back (that wouldn't work so well with a round horn).
That's the nice thing - because of the large asymmetry (compared to a round one), it's not really necessary (although it would surely improve it further).
From the construction point of view, it's no problem either - you can continue to bend the ply back as much as you want. With an octagon, I would definitely add such rolling back. With a rectangle, I would go without.
From the construction point of view, it's no problem either - you can continue to bend the ply back as much as you want. With an octagon, I would definitely add such rolling back. With a rectangle, I would go without.
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