In the future, if space permits, I can see myself building a Klangfilm Euronor-like system in a (double) wall.
We live in the here and now, but there's much to learn from the past.
This applies to acoustics - I'm regularly amazed at the amount of knowledge that was already available worldwide at the beginning of the last century, but sometimes even more so to other areas of knowledge.
Comment accompanying the photo:
"The four speakers placed side by side in front are German Klangfilm speakers, said to be cherished by Hitler, in the middle, and Western Electric, which wrote world audio history, on both wings."
As is widely known, a Wirtschaftswunder (economic miracle) took place in Germany twice in the last century: during the 1930s and again from the late 1940s.
It's much less known that the same parties behind these 'miracles' are currently destroying the German economy and in the 1930s were already planning what now causes many victims every day in Ukraine.
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Either I added phase to what they said or they said it erroneously.
Pattern flip as it applies to directivity, sounds more grounded in reality
The more I investigate, I believe I added "phase" to it. Still "Pattern flip" throws me off, I expect something to flip as in "to turn or roll from one side to the other"
""Below 2 kHz the vertical beamwidth is actually greater than the horizontal beamwidth! This is sometimes referred to as “pattern flip”. The vertical coverage pattern of the horn, which is supposed to be narrower than the horizontal coverage pattern, is now the broader coverage angle. In other words, the horizontal and vertical beamwidth have flipped with respect to which is greater and which is lesser. This is particularly noticeable when examining the directivity balloons""
This makes sense I guess.
""Below 2 kHz the vertical beamwidth is actually greater than the horizontal beamwidth! This is sometimes referred to as “pattern flip”. The vertical coverage pattern of the horn, which is supposed to be narrower than the horizontal coverage pattern, is now the broader coverage angle. In other words, the horizontal and vertical beamwidth have flipped with respect to which is greater and which is lesser. This is particularly noticeable when examining the directivity balloons""
This makes sense I guess.
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I don't like the phrase pattern flip very much either; though I understand it now, i found it misleading initially. To me it suggested something quite suddenly reversing state, which isn't really the case. However it is popularly used, so has probably stuck by now.
Personally I'd probably elect to use a round or square waveguide if possible, but there are cases when size and/or driver spacing may well change my mind. A difficult call, really.
Personally I'd probably elect to use a round or square waveguide if possible, but there are cases when size and/or driver spacing may well change my mind. A difficult call, really.
Thanks for that. The word 'wrap' might be best to describe this practicality of a phase plot (LINK).
I have this thread put aside for such occasions - https://www.diyaudio.com/community/threads/is-it-best-to-use-a-non-axisymmetric-waveguide.375799/
You read my mind... There is a reversal of state, though. The wall angles of the upper and lower walls vs the sides cause the the vertical polar to be more narrow towards the mouth of an elliptical/rectangle mouthed waveguide....that is until the wavelengths become too big to control, which happens first for the vertical polar....at that point the width of the waveguide is still showing directivity while the vertical polar is wide open
The state reversal is V polar being more narrow to H polar being more narrow... To me it is sort of irrelevant and what matters is the loss of directivity, not so much how it compares to H to V polar
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Why creating the problem in the first place and then solve it with something else?
There are mid-high horns that have a big Hor to Vert ratio, like horizontal slots. I think of a Visaton horn and Decware has one too if I recall correctly. Both horns also have fins. Is there any vertical directivity control in those?
Maybe you mean the Smith dispersion horn. Visaton build a modified / simplified version. These horns have the complete loss of directivity control as Design target as the diameter of the cells is mostly smaller than the radiated wavelength.
If you refer to the picture in post 12001 : speakers in the middle are no Klangfilm, not original and have no
historical ancestor in construction or style and surely any appreciation by said person is impossible this way.
I also heard we should beware of political statements in this forum.
So multicell horns also have no pattern control as each of the small cells are smaller than the wavelength of the frequency they radiate? Or does the output combine to a controlled radiation pattern?
A multicell theoretically combines to a coherent wave front where all cells join together at mouth. I repeat: theoretically. It all depends how the wave front looked like at the entry section of cells.
It is quite similar to some manufacturers recommendation to stack their rectangular horns horns vertically for PA purposes.
It is quite similar to some manufacturers recommendation to stack their rectangular horns horns vertically for PA purposes.
I can still not follow you. What are "unnatural shifts"? Or do you mean nulls and peaks for the off-axis summation of two sound sources?