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Multi-Way Conventional loudspeakers with crossovers

tweeter with blinds-like waveguide
tweeter with blinds-like waveguide
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Old 12th June 2019, 02:31 PM   #11
Galu is offline Galu  Scotland
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And here it is with wavefronts (point source on the right this time, parallel wavefronts on the left).
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Old 12th June 2019, 02:40 PM   #12
Galu is offline Galu  Scotland
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Quote:
Originally Posted by Galu View Post
Disperses the sound to stop beaming of high frquencies.
That was inaccurate! I should have said 'Controls the dispersion of high frequencies'!
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Old 12th June 2019, 03:38 PM   #13
carlthess40 is offline carlthess40  United States
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Bottom line is they help with the sound and control of the high frequencies
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Old 12th June 2019, 04:08 PM   #14
JMFahey is offline JMFahey  Argentina
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It widens dispersion.
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Old 12th June 2019, 04:28 PM   #15
emosms is offline emosms  Bulgaria
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Thx .
Seems it attempts to create a parallel beam of sound into the horizontal plane (the vertical dispersion diagram).

Could that solve or ease a particular problem?

- I have a midbass and twitter not centered to a distance of one wavelength the crossover frequeny.
According to some sources, it is better to position them at 1/2 the wavelength distance.

Both ways imposible at xover frequency of 5k ~7 cm c/c distance.
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Old 12th June 2019, 04:37 PM   #16
Galu is offline Galu  Scotland
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Originally Posted by JMFahey View Post
It widens dispersion.
The spherical wavefronts from the point sound are diverging outwards and this would result in wide dispersion.

The acoustic lens converts the diverging wavefronts into parallel wavefronts which results in a more controlled and uniform dispersion.

Isn't it the case, as emosms has just said, that the acoustic lens gives a uniform horizontal dispersion while narrowing the vertical dispersion?

Isn't this dispersion pattern extremely useful in PA for proper audience coverage of high fequencies?
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Old 12th June 2019, 04:47 PM   #17
gabdx is offline gabdx  Canada
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There was a hifi version of the PA type, I saw it 25 years ago in a store, it was already old technology... I love the honeycomb pattern although, from what I heard on youtube, it is made of wood and very costly. Sounds terrific through headphones on youtube..

Click the image to open in full size.

Click the image to open in full size.

THere is a new company that upgraded the design and made it sound better, cannot find it now.
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Last edited by gabdx; 12th June 2019 at 04:53 PM.
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Old 12th June 2019, 04:54 PM   #18
Galu is offline Galu  Scotland
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Quote:
Originally Posted by emosms View Post
Could that solve or ease a particular problem?
If I'm reading it correctly, the narrowed vertical dispersion would prevent treble energy being wasted through being directed towards the ceiling or the floor.
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Old 12th June 2019, 05:02 PM   #19
Galu is offline Galu  Scotland
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Quote:
Originally Posted by gabdx View Post
There was a hifi version of the PA type, I saw it 25 years ago in a store, it was already old technology... I love the honeycomb pattern
Your photos show multicellular horns.

Quote:
The multicellular horn is a cluster of smaller exponential horns, each with a small mouth to avoid beaming in a large frequency range, but together they form a sector of a sphere large enough to control directivity at low frequencies the cluster acts as one big horn at low frequencies. At high frequecies the individual horns start to beam, but because they are distributed in an arc, coverage is still quite uniform.
Acoustic Horn | Harvard Natural Sciences Lecture Demonstrations
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Old 12th June 2019, 05:09 PM   #20
picowallspeaker is offline picowallspeaker  Italy
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Quote:
Originally Posted by Galu View Post
Your photos show multicellular horns.
Your pics show light, not sound.
Sound travels very slow compared to light.
Different reality perception & organization
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