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Horn waveguide atop a 4" FR driver?
Horn waveguide atop a 4" FR driver?
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Old 18th September 2019, 02:44 AM   #1
jjasniew is offline jjasniew  United States
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Default Horn waveguide atop a 4" FR driver?

What would happen if one took one of these Dayton 10" circular waveguides, cut it at the small end to fit an appx 4" opening and used it with a 4" full range driver?

Would I then lose baffle edge diffraction issues?

Thanks!
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Old 18th September 2019, 06:42 AM   #2
TNT is offline TNT  Sweden
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Diffraction occurs where a wave encounters a sharp (compared to the wavelength) bend.

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Old 18th September 2019, 07:10 AM   #3
GM is offline GM  United States
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Right, so a horn must have a rollover with a radius acoustically large enough to keep it from diffracting [note the large dark horn]: https://www.cessaro.de/fileadmin/sit...ucts/alpha.jpg

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Old 18th September 2019, 07:56 AM   #4
perceval is offline perceval  Taiwan
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I'm using a rectangular horn with a 2.5" driver, open back.

I like the result.
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Old 18th September 2019, 03:36 PM   #5
LeifB60 is offline LeifB60  Sweden
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I like yours answers. Please don't stop.
It is hard to find best driver..
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Old 19th September 2019, 01:41 AM   #6
Sub Sonic is offline Sub Sonic  Australia
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Quote:
Originally Posted by GM View Post
Right, so a horn must have a rollover with a radius acoustically large enough to keep it from diffracting [note the large dark horn]: https://www.cessaro.de/fileadmin/sit...ucts/alpha.jpg

GM
What audible effects does diffraction have on the sound? Just curious as currently I have a SEOS 15/DE250 sitting atop the woofer cabinet by itself. XO is around 1kHz.

Cheers,

Matt
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Old 19th September 2019, 06:03 AM   #7
jjasniew is offline jjasniew  United States
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Perceval - what's the dimensions of your rectangular horn? The horn in the link GM posted is huge, 100cm. In the Cessaro home page link, they show a "Qianlong" system that has a horn like coupler on both speakers, but the larger speaker's arrangement is closest to what I was imagining hacking the Dayton product.

So, what's going on when someone puts a circular waveguide over the top of a speaker, as they've clearly done in this Cessaro Qianlong system?
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Old 19th September 2019, 06:59 AM   #8
GM is offline GM  United States
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What audible effects does diffraction have on the sound?
Varies, kind of like a [added] sibilance that lots of folks like as it adds 'clarity'/'detail' and/or adds a layer of fine noise that lots of folks like for its 'richness' kind of like vinyl does [at least old vinyl, no experience with digital].

Experiment with some open cell foam wrapped around the mouth, extending a bit in front and wad up some cheap cotton towels to place around it to isolate it from the cab to get the worst of it.

Experiment with fish tank filters in the throat and adjust the HF if need be.

GM
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Old 19th September 2019, 07:02 AM   #9
GM is offline GM  United States
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Originally Posted by jjasniew View Post
So, what's going on when someone puts a circular waveguide over the top of a speaker
Load it with a point source driver like in your 1st post or a horn literally above a woofer box?

GM
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Old 20th September 2019, 06:25 AM   #10
jjasniew is offline jjasniew  United States
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GM, I was thinking of using a 4" point-source driver. Currently mounted on an 8" circular baffle, centered. I've read that this is worst case for diffraction and was wondering if this waveguide by Dayton could pull the sound away from interacting with the circular baffle board. Given the waveguide is circular also and of reasonable size. I'm also considering introducing a new baffle board shape, that I can just sandwich atop the existing circular one. I have no idea what shape I should make it - another + for Dayton's product. Given that its effect would be beneficial, which is my true question.

About 30 years ago, I was led to a church that was throwing out some speakers. All the drivers were long gone, but one thing I picked up was a multicell horn like on top of the speaker in your avatar picture. Whoever took the driver unbolted it at the horn throat, where each horn cell starts in a radial pattern. I vaguely recall building a plate to put a regular speaker at that point, slot loaded to match the throat geometry. It made sound, I used it for something like part of a PA system, then all memory of it is lost. Thanks,
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