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Unitizing / synergizing horns - what type of horn works
Unitizing / synergizing horns - what type of horn works
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Old 17th April 2019, 08:31 PM   #1
pelanj is online now pelanj  Czech Republic
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Default Unitizing / synergizing horns - what type of horn works

Intro: I like single drivers (with subs). I like horns. Therefore I imagine that I would most probably like the sound of a virtual point source horn, something like the works of bwaslo, xrk971 and bushmeister and maybe others.

The horns/waveguides are not that easy to get, so I wonder, could I use CD waveguides of similar size? Biradial or with diffraction slot, etc. Is there any limitatio. but size of the horn in unitizing/synergizing it? A cheap test, proof of concept first, then the real thing, that is what I imagine.
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Old 17th April 2019, 09:06 PM   #2
Brinkman is offline Brinkman  United States
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Unitizing / synergizing horns - what type of horn works
Bill’s (bwaslo’s) small syns used the SEOS-15 waveguide and a DNA-360 compression driver. If you try contacting Erich at DIY Sound Group he might be able to help you out. Alternatively, you could try the swap meet forum here or the gear forum at AVSforum. People often sell the waveguides and compression drivers together.
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Old 17th April 2019, 09:16 PM   #3
kipman725 is offline kipman725  United Kingdom
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I'm working on using a P-audio PH-4220:
BM-D446 on PH-4220
I have successfully mounted the 4 midranges to the horn and will post an update once I have done some measurements. I will also post some templates for the woofer mounts. Performance still uncertain as its very much a work in progress.
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Old 17th April 2019, 11:02 PM   #4
pelanj is online now pelanj  Czech Republic
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Shipping and customs make cost kind of prohibitive if shipping from US, I could not google a good source of SEOS waveguides. Brinkman, could you please post some links?

Kipman725, interesting thread, subscribed. Compression driver with 4 midranges for maximal efficiency sounds nice.

This one looks like a good candidate: Dayton Audio H110 1" Constant Directivity Horn 90x40 1-3/8"-18 TPI - SoundImports

IMHO less ideal: Dayton Audio H812 1" Exponential Horn 100x60 2-Bolt - SoundImports

SEOS like, but smaller: Dayton Audio H6512 6-1/2" x 12" Waveguide 1-3/8"- 18 TPI - SoundImports
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Old 18th April 2019, 03:13 AM   #5
Brinkman is offline Brinkman  United States
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Unitizing / synergizing horns - what type of horn works
Quote:
Originally Posted by pelanj View Post
Shipping and customs make cost kind of prohibitive if shipping from US, I could not google a good source of SEOS waveguides. Brinkman, could you please post some links?
The SEOS waveguides are manufactured by Erich at DIY Sound Group so he is going to be the only true source for them, second-hand sales withstanding. I know the website has them listed as out of stock; email Erich anyway and ask about the availability. He usually doesn’t respond right away so be patient. DIYSG is a non-profit organization that he runs on the side from his main source of income. The listed price for the items on the site is essentially him passing on his manufacturing and handling fees.

You could also try posting a “Wanted: SEOS-15 & DNA-360” in the swap meet forum. In your OP you could state your EU preference.

Good luck!
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Old 18th April 2019, 06:45 AM   #6
AllenB is online now AllenB  Australia
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Quote:
Originally Posted by pelanj View Post
This one looks like a good candidate: ...
Have you considered where you would cross? How low does a compression tweeter go on its own? I'm thinking these horns wouldn't be doing much at those frequencies.
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Old 18th April 2019, 09:16 AM   #7
kipman725 is offline kipman725  United Kingdom
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The Dayton Audio H110 is a poor choice:
1. Mid ranges must be mounted a long way from the throat which causes them to not be able to go high in frequency due to reflection null caused by reflection off the compression driver.
2. Screw on type compression driver attachment. Screw on type drivers are usually cheaper and don't go as low in frequency than the bolt on type.

I would look for horns that have flat sections for mounting the mids close to the throat. This would mean a conical expansion followed by another expansion (the second expansion improves mouth transition and loading).
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Old 18th April 2019, 06:44 PM   #8
pelanj is online now pelanj  Czech Republic
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Brinkman, thanks for explanation and advice. The price for the WG itself is fair and OK, it is the shipping and customs that are a bit annoying.

Kipman725, I see - mids as close to throat as possible.
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Old 19th April 2019, 08:16 AM   #9
3ll3d00d is offline 3ll3d00d  United Kingdom
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I thought they were manufacturered by autotech in Poland -> SEOS - Horns by Auto-Tech

though perhaps diysg get the plastic ones made themselves

I know I ordered some fibreglass seos horns from a local seller some time ago - SEOS hORNS – GPoint Audio - who ordered them from auto-tech
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Old 19th April 2019, 08:27 AM   #10
jzagaja is offline jzagaja  Poland
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Unitizing / synergizing horns - what type of horn works
Autotech makes fiberglass and casted SEOS. Dragon3D in Poland can print any horn you like. Biggest 1 meter like in AiA Cinema Black Swan (300Hz waveguide) is about 800eur each, 5mm thick, 137 hours print time. Smaller 15" 10mm thick is about 250 eur each.
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