Will this horn/driver combo beam? - diyAudio
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Old 14th February 2010, 06:37 PM   #1
Defo is offline Defo  Norway
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Question Will this horn/driver combo beam?

I used to have a stereo-lab 400hz tractrix horn coupled to an Altec 299 1,4" compression driver. This combo beamed too much for my taste.

Will a combo with a Radian 2" driver with the horn below beam as much? And how high will it reach 16-17 khz with some eq?

The horn is a Le-Cleach 48 cm wide, 24 cm deep.
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Old 14th February 2010, 07:34 PM   #2
MaVo is offline MaVo  Germany
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All horns which are not constant directivity will beam in the upper frequencies, so this one will beam too.
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Old 14th February 2010, 07:42 PM   #3
Defo is offline Defo  Norway
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Quote:
Originally Posted by MaVo View Post
All horns which are not constant directivity will beam in the upper frequencies, so this one will beam too.
This begs the question, will it beam as much as the 1,4" 400hz Stereo-Lab tractrix horn? Which is deeper and has a more narrow expansion rate.
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Old 15th February 2010, 12:13 AM   #4
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I like the Le Cléac’h, I had never seen it before
(Azurahorn -Le Cleac'h Acoustic Horn Loudspeakers)

Basically, all compression drivers have a high end rolloff in their power response, due to a combination of moving mass and also phasing of the sound across the diaphragm. A truly constant directivity horn will therefore roll off at the high end. But it's not the horn's fault, it is a natural feature of all drivers. Some horns try to get flat response on axis, and to do so they must progressively beam the highs to keep up the on-axis SPL.


I found this analysis:
LeCleac'h horn vs Conical Horn
It's all simulation, but seems likely. Bottom line would be the Le Cléac’h should beam a lot less than a typical exponential. Unfortunately, I'm not recalling about Tractrix and beaming. Are you really objecting to beaming, or to some kind of resonant peak?

Last edited by head_unit; 15th February 2010 at 12:16 AM.
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Old 15th February 2010, 07:54 AM   #5
jzagaja is offline jzagaja  Poland
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60cm JMLC, 2", starts to beam above 20deg:

Min Phase Horn with Faital Drivers at German DIY Show in Gelsenkirchen
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Old 15th February 2010, 09:19 AM   #6
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Yes, Tractrix and Le Cleach horns beam. That is their nature and they have very good sound but if you are concerned with beaming then don't sit closer than - lets say 12 feet from the speakers. All else being equal, I do not think tractrix has any problems provided it is not expected to do super wide range duty.

Cheers
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Old 19th February 2010, 03:09 AM   #7
Defo is offline Defo  Norway
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Why not make a conical shaped "phase plug" inside the horn to improve dispersion? Held in place by a geddes style foam plug? Better dispersion, and redused HOM's at the same time.
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Old 19th February 2010, 06:25 PM   #8
Defo is offline Defo  Norway
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Quote:
Originally Posted by Defo View Post
Why not make a cone shaped "phase plug" inside the horn to improve dispersion? Held in place by a geddes style foam plug? Better dispersion, and redused HOM's at the same time.
Bump, anyone tried this?
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Old 7th May 2010, 03:04 AM   #9
Defo is offline Defo  Norway
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Quote:
Originally Posted by Defo View Post
Why not make a conical shaped "phase plug" inside the horn to improve dispersion? Held in place by a geddes style foam plug? Better dispersion, and redused HOM's at the same time.
Bump again
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Old 7th May 2010, 03:41 AM   #10
limono is offline limono  United States
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Why not add a tweeter and two more horns ? If you want to use tractrix you need many horns for best results. Otherwise use CD horn and EQ the heck of it.
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