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Old 1st December 2017, 11:10 PM   #1
mkane77g is offline mkane77g  United States
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Horn Drivers
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I want to build some horn's. 12 sided, something like these: Oswalds Mill Audio - Loudspeakers | OMA but don't have a clue as to which drivers go on the smart end.
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Old 2nd December 2017, 01:29 AM   #2
planet10 is offline planet10  Canada
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Something small, and (maybe) low Q so that when you reinforce the LF range it doesn’t overwelm the HF. But how that works is highly dependent on the actual horn. Horns have typically a 3-4 octave bandwidth, a narrow conicall horn like those linked probably need EQ or a very careful match with the driver.

dave
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Old 2nd December 2017, 12:15 PM   #3
Scottmoose is offline Scottmoose  United Kingdom
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AFAIK all the OMA conical horns use compression drivers, some of them restored vintage RCA units (AC1) and Cogent in their Imperia.
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Last edited by Scottmoose; 2nd December 2017 at 12:17 PM.
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Old 4th December 2017, 03:09 AM   #4
mkane77g is offline mkane77g  United States
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Not many manufacture's publicize specs.
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Old 4th December 2017, 03:15 AM   #5
daqvin_carter is offline daqvin_carter  United States
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Try to buy the wood as soon as you can and let it sit for at least 6 months if you can.
Pine bought from somewhere like Home Depot will shrink a little more after a while.
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Old 4th December 2017, 04:17 PM   #6
mkane77g is offline mkane77g  United States
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^^^^^^^thank's for that. Local cabinet shop has a scrap pile that I can dig through and some of the wood has been there for years. Like a kid in a candy store.
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Old 4th December 2017, 05:35 PM   #7
GM is offline GM  United States
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Quote:
Originally Posted by mkane77g View Post
Not many manufacture's publicize specs.
AFAIK, nobody publishes compression driver specs and not a quick process to measure them either AFAIK.

For point source [cone] drivers, the requirements can be figured out knowing the horn's XO points, throat, mouth, axial length, flare factor. We know from its shape the latter is conical, so either find the others to maybe find a suitable cone driver or design a horn that will at least work between these XO points.

GM
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Old 4th December 2017, 08:14 PM   #8
mkane77g is offline mkane77g  United States
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Thanks. I'll build then measure. Time is on my side unless I don't wake up in the morning.
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Old 5th December 2017, 03:42 AM   #9
GM is offline GM  United States
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So you know their horn's dims, XO points? If not, then better to first find a driver for your desired BW........

GM
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Old 5th December 2017, 03:49 AM   #10
croweproductions is offline croweproductions  Canada
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I made a pair. The compound angles are very difficult to calculate but you can use my drawing at the link below. Itís for a lowther. Regarding drivers, you need a low QTS driver. Something with a very powerful magnet with a rising frequency response, because the horn amplifies the lower midrange.

Joseph Crowe's DIY Speaker Building Blog: Lowther DX-3 Conical Horn
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