Conical horns 600Hz and up - diyAudio
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Old 30th June 2013, 07:15 PM   #1
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Default Conical horns 600Hz and up

Im looking for some plans to build front speaker horns,

First ones will be straight conical horns made in a similar way to OMA's

Click the image to open in full size.

Next will be Tractrix and then big JMLC

These will be powered by an as yet unknown 2" Compression driver, and with a cut off between somewhere between 200-500Hz (size dependant)

I plan to make from either 18mm birch plywood as a test, and then European Oak, cutting the compound angles on a festool ts55 and on my table saw.

If anyone has any advise or plans or information on building the conical one, please chime in.
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Old 30th June 2013, 10:52 PM   #2
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Nice in-depth build here:

https://sites.google.com/site/diyfir...-midbass-horns

Which led me to the online calculator i need

Compound Miter Saw Calculator

So now I need to decide on how many petals, how long and how the driver meets the horn,
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Old 30th June 2013, 11:29 PM   #3
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The originator of the design that OMA uses is Bill Woods of Acoustic Horn Co. Once upon a time you could buy the cast aluminum throats along with mounting plate for your driver from him. I don't know if he still does it or not.
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Old 30th June 2013, 11:33 PM   #4
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I read not...

Turning something wouldn't be a problem and would smooth out the round to faceted issue.
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Old 1st July 2013, 12:06 AM   #5
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I read not?
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Old 1st July 2013, 09:01 AM   #6
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Sorry, late night forum righting in bed...

I have read that he used to sell them separately, however only now sells them as a complete package.
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Old 1st July 2013, 02:00 PM   #7
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First attempt using an angled fence on my table saw resulted in the mitred pieces flying back at me, didn't feel too safe, i think a Festool Circular saw is called for...

Last edited by Studio Au; 1st July 2013 at 02:14 PM.
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Old 2nd July 2013, 08:10 AM   #8
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I found some scanned in images of horn sizes, around 300Hz.

They seem to be 24" long, with a 27" mouth. Flare at 75*, can anyone verify this?
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Old 2nd July 2013, 05:12 PM   #9
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I want to make these...

Click the image to open in full size.

Segmented wood turnings|Breezy Hill Turning
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Old 3rd July 2013, 12:06 PM   #10
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Festool TS55 is here...

If I can find some time I will try and get a prototype whipped up.
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