Vladimir Filevski
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Their lack of worry does not mean the diffraction does not exist.
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The manufacturers consider that there is a transverse acoustic wave existing in air, and that the wave propagation space is clearly divided into near and far zones. In the near zone, the transverse acoustic wave is characterised by a low propagation speed, rapid attenuation of amplitude, and periodic inversions from the emitter with increasing distance from the emitter. There is a scientific paper written by a husband-and-wife team on this.
Vladimir Filevski
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That manufacturer doesn't know the most basic facts about sound waves, such as:
Transverse acoustic waves don't exist in gases (e.g. air)!!!
There you are!
Vladimir Filevski
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And here you are, on the same side of ignorance.
Read this quote:
"The shear stress in a gas is non-existent. Hence the transverse mode is weak in a liquid and non-existent in a gas."
https://www.quora.com/Why-can’t-a-gas-transmit-a-transverse-wave
Did you read what Linkwitz said about the diffraction? Here it is again: https://www.linkwitzlab.com/diffraction.htm
Read this quote:
"The shear stress in a gas is non-existent. Hence the transverse mode is weak in a liquid and non-existent in a gas."
https://www.quora.com/Why-can’t-a-gas-transmit-a-transverse-wave
Did you read what Linkwitz said about the diffraction? Here it is again: https://www.linkwitzlab.com/diffraction.htm
Ah, Quora!
You can believe what you like. I'm not going to argue with you (or anyone) on this matter. There was a time, when people believed that the world was flat.
Simply, I like flat speakers, and know why they work. That's all there's to that.
Vladimir Filevski
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Ah, you really think Siegfried Linkwitz didn't know anything about diffraction and loudspeakers?! 
Quoted answer from Quora was from
Jerzy Michał Pawlak , PhD in High Energy Physics (experimental)
And your quote about the non-existence of diffraction waves and existence of transversal sound waves in air comes from where? Link, please!
Sadly, even today there are people which believe the Earth is flat... and there are transversal sound waves in air... and there are no diffraction waves...
Quoted answer from Quora was from
Jerzy Michał Pawlak , PhD in High Energy Physics (experimental)
And your quote about the non-existence of diffraction waves
and existence of transversal sound waves in air comes from where? Link, please!Sadly, even today there are people which believe the Earth is flat... and there are transversal sound waves in air... and there are no diffraction waves...
Don't worry, I can speak to him in his own language.
Vladimir Filevski
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You may understand the language, but you don't understand the basic physic.
cavedriver
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seriously, please take this out of this thread, it's horrendously OT.Don't worry, I can speak to him in his own language.
MattHooper
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View attachment 429307
"The unique shape of the Estelons' enclosures—the antithesis of traditional box designs—is intended to avoid diffraction and other colorations. CEO and co-founder Alissa Vassilkova-Rajatalu noted proudly in an email to me that there are no parallel walls and that the surfaces are almost entirely curved. She also relayed that "Inside, each internal chamber is tailored to suit its specific driver." The company turns that approach up to 11: in order to combat microphonics and small vibrations, even the crossovers get their own subenclosures.
Estelon X Diamond Mk II loudspeaker
Taste is a funny thing. Love cilantro? Millions swear it tastes like soap. Similarly, design cognoscenti will gush over a minimalist Scandinavian sofa that others dismiss as just a pricey plank with delusions of grandeur.www.stereophile.com
The absence of parallel surfaces cuts down on standing waves."
I like them better every time I see them
I’ve listened to a couple of the big Estelon models at my friends house.
They are pretty impressive. Not my favourite speakers, but there’s definitely no sense of the sound coming from a box, and they combine an impressive combination of clarity imaging and dynamics/bass punchiness.
Good question!
The central coax's radiation pattern largely avoids the cabinet edges due to the waveguide loading (and the large-radius transition as the waveguide blends into the front baffle avoids diffraction at the waveguide's mouth).
The radiation pattern of a single midrange dome would strongly illuminate the cabinet edges, but the radiation pattern formed by the four of them in combination has a much narrower strong central lobe which, again, avoids the cabinet edges. I think the considerably weaker side-lobes would still illuminate the cabinet edges.
Not sure of the crossover frequency to the front woofer but towards the lower end of the spectrum diffraction effects tend to be less objectionable anyway, and then below the baffle-step frequency the sound starts wrapping around instead of reflecting/re-radiating at the cabinet edge.
So I would not say that diffraction has been eliminated, but it has probably been pushed below the thresholds where it is detrimental to any significant extent.
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In most boxes, the woofer is placed on the side, and sometimes even the mid/bass speaker. As a result, the sound waves that travel towards the listener in that "sweet spot" reach them more quickly along the side baffle than those that might hit the side wall and reflect back towards the listener. Most of these boxes with side-firing speakers are flat. So, what about the "diffraction" of these side firing speakers?
This has not been my experience.
Imo it depends on the specifics. With the woofer on the inner side of the enclosure, there would be a reduced time differential between arrival of the edge reflection and the direct sound from the woofer, so any resulting ripples in the frequency response of the direct sound might be pushed up above the crossover frequency. Considered in isolation I think this would be beneficial, but imo it would have to be considered in the context of the entire system. For instance the directivity index would tend to be lower with a side-firing woofer, so imo it's a juggling of tradeoffs... like just about everything else.
Petrushka
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A Shmoo, for those of a certain age.
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