Jean Michel on LeCleac'h horns - Page 2 - diyAudio
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Old 11th March 2009, 04:27 PM   #11
Jmmlc is offline Jmmlc  France
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Hello Tinitus,

I know thar some difference exists between my recommendations and what people do with those.

You'll see on the pictures on the page:
http://www.melaudia.net/rueil0903.php
what I consider as the maximum width for an axial Le Cléac'h horn.
We'll have a public demo of that horn during the weekend of 28 & 29 (march 2009).

For cut-off frequency under 150Hz I don't recommand the complete axial horn calculated by my method.
I recommand a quarter of axial horn placed on a corner of the listening room as on the picture:
http://ndaviden.club.fr/pavillon/axial_murs.gif


For very low cut-off frequency I recommand 2 halves of quasi-cylindrical waves Le Cléac'h horns
http://ndaviden.club.fr/pavillon/cyl_mur.gif

The spreadsheet to calculate that horn can be dowloaded for free at: http://ndaviden.club.fr/outils/cylind.zip

You can see a picture of such a realisation at:
http://img383.imageshack.us/my.php?i...280x768ac0.jpg

Best regards from Paris, France

Jean-Michel Le Cléac'h

Quote:
Originally posted by tinitus
Hi Jean Michel

I understand what you say about mouth curves, that they should prolong all the way, and not stop at 180gr

But surely you cant demand that at low frequencies, where we are bound to make compromises

Is there a frequency where it gets important or where its less important

Im mostly thinking of 150-1khz

edit,
I have been trying to find your previously posted layout of an idialised elliptical horn, but cant find it

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Old 11th March 2009, 04:37 PM   #12
soongsc is offline soongsc  Taiwan
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Hello Jean-Michel,

Is there no relationship between T and the initial angle? Is there a geometrical deffinition in relation with T?
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Old 11th March 2009, 04:51 PM   #13
Jmmlc is offline Jmmlc  France
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Hello Soongsc,

T is a coefficient in the general frouma linking the area and the distance to throat for horns of the hyperbolic family

http://www.bd-design.nl/contents/media/hypo.gif

T = 0 : catenoidal horn
T between 0.5 a,d 0.707 : hypex horn
T = 1 : exponential horn
T infinite for conical horn.

Best regards from Paris, France

Jean-Michel Le Cléac'h




Quote:
Originally posted by soongsc
Hello Jean-Michel,

Is there no relationship between T and the initial angle? Is there a geometrical deffinition in relation with T?
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Old 11th March 2009, 05:50 PM   #14
Pano is offline Pano  United States
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Quote:
Originally posted by Jmmlc
In fact my contribution should be looked more as a method to calculate horns than rather a new expansion.

All anterior methods rely on an hypothesis for the shape of the wavefronts.
Ah! D'accord! Now I understand. Sometimes it just needs to be spelled out in plain langauge. =)
Thanks so much for that - it really helps understand what you are doing. Very interesting information in your post.

Thanks to Angelo for starting the thread.
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Old 11th March 2009, 06:08 PM   #15
tinitus is offline tinitus  Europe
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Jean-Michel
Fantastic "feedback"
Very informative

Thank you
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File Type: jpg lecleach midhorn.jpg (18.6 KB, 4714 views)
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Old 11th March 2009, 08:45 PM   #16
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Jean-Michel, great answers you give!

In wich space do you design this horn:

http://ndaviden.club.fr/pavillon/cyl_mur.gif

floor placement? or floor/wall?


Regards / Petter
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Old 11th March 2009, 08:59 PM   #17
tinitus is offline tinitus  Europe
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Quote:
[i]Originally posted by Petter Persson

In wich space do you design this horn:

http://ndaviden.club.fr/pavillon/cyl_mur.gif

floor placement? or floor/wall?


Regards / Petter [/B]

Could it be something like this one
Looks cool btw

Kind of like half a JBL Paragon
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Old 11th March 2009, 09:01 PM   #18
pk is offline pk  Denmark
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Hi Jmmlc,

Thanks for sharing all the knowledge regading your horns!

I have a question regarding the system that according to your post above will be demonstrated ultimo March:

http://www.melaudia.net/rueil0903.php

Could you please specify the crossover points of this system?

Thanks!

Best regards
Peter
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Old 11th March 2009, 09:33 PM   #19
tinitus is offline tinitus  Europe
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Quote:
[i]Originally posted by Petter Persson

floor placement? or floor/wall?

[/B]

Or maybe more like this one
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Old 11th March 2009, 09:37 PM   #20
tinitus is offline tinitus  Europe
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I know this is approved
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