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Multi-Way Conventional loudspeakers with crossovers

Jean Michel  on LeCleac'h  horns
Jean Michel  on LeCleac'h  horns
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Old 13th June 2012, 11:26 PM   #1331
mwmkravchenko is offline mwmkravchenko  Canada
Mark Kravchenko
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Jean Michel  on LeCleac'h  horns
Very interesting Jean-Michel.

Thanks for sharing the photos and the write up.

I have to use my rusty french. It is good mental exercise!
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Old 14th June 2012, 07:47 AM   #1332
leifchristensen is offline leifchristensen  Norway
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fantastic horns!
nothing sexier (in audio) than wood horns!

best
Leif
Norway
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Old 14th June 2012, 10:48 AM   #1333
hasselbaink is offline hasselbaink  Denmark
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Default Are they selling their creations?

Quote:
Originally Posted by Jmmlc View Post
Hello,

My friend Nicolas Davidenko and Frank Delbauve who build Hifi on purpose loudspeakers enclosures, used a 3D CNC to make Iwata-JMLC horns in plain wood.

Here is few pictures of an Iwatat-JMLC (Fc 600Hz, throat diameter = 1 inch).

Le blog de audiobricolos

Direct URL for pictures :

http://img.over-blog.com/300x204/6/15/98/16/iw600-1.jpg

http://img.over-blog.com/300x214/6/15/98/16/iw600-2.jpg

http://img.over-blog.com/300x221/6/15/98/16/iw600-3.jpg

a 1.5inch version used to be build too :
http://img.over-blog.com/500x241/6/1...iw600-2435.jpg

and a 220Hz Iwata-JMLC horn is under construction.
http://img.over-blog.com/500x356/6/1...220-2482-3.jpg

2 views of the fproject are at :
http://img.over-blog.com/174x300/6/1...6/3voies-1.jpg
http://img.over-blog.com/300x293/6/1...6/3voies-2.jpg

Best regards from Paris, France

Jean-Michel Le Cléac'h
Hi Jean-Michel,

Do you know if these guys are selling Iwata horns to the audiophile community?

Kind regards
Kris
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Old 14th June 2012, 01:35 PM   #1334
Jmmlc is offline Jmmlc  France
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Quote:
Originally Posted by hasselbaink View Post
Hi Jean-Michel,

Do you know if these guys are selling Iwata horns to the audiophile community?

Kind regards
Kris
Hello,

Do you mean classical Iwata horns? In that case the answer is no.

For what I know if there is some demand Frank Delbauve should be able to build Iwata-JMLC in wood
Fc = 600Hz, 1 inch
Fc = 600Hz, 1.5 inch
Fc = 220Hz, 2 inch (build in several parts with 4 parts for the mouth).

But this is not sure and for the moment the only conatct is through Nicolas Davidenko who did the 3D CAO work from the cloud of 40000 points I calculated for him.

To contact him :

nicolasdavidenkoXsfr.fr

replacing the X by the arobase.

Best regards from Paris, France

Jean-Michel Le Cléac'h
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Old 14th June 2012, 01:43 PM   #1335
franckd is offline franckd
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Bonjour Jean-Michel

Si c'est maintenant possible.

FranckD
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Old 14th June 2012, 01:48 PM   #1336
Cal Weldon is offline Cal Weldon  Canada
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Jean Michel  on LeCleac'h  horns
Bonjour FranckD,

Il s'agit d'un forum anglophone. Si vous souhaitez poster en français, traduire vers l'anglais ainsi.

Merci.

Hello FranckD,

This is an English speaking forum. If you wish to post in French, translate it to English as well.

Thank you.
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Old 14th June 2012, 02:41 PM   #1337
carolus is offline carolus  Belgium
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Location: Brussel
Hi frandD,
You did a graet (horn-) job & good skils to ...
Congrats.
I wish you the best for further horn realisations ...
Allez, salukes & greetings.
Karel
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Old 14th June 2012, 03:13 PM   #1338
whgeiger is offline whgeiger  United States
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Default Curve Multiplicity

Quote:
Originally Posted by Charcoal View Post
If I want to DIY e-jmlc horn, after simulations in H-resp, how can I draw the curve? Any soft-calculators or something like that?
It is not a single curve; it is a family of curves that form a mesh (coordinate system), which defines the boundary surface of the horn. If [z] is the horn axis, then in subsequent [x,y] sections leading away from the throat, a circular to elliptical (or oval) transformation takes place where the loci of the major and minor axis are determined by two dependant sets of points using JMLC's method. I will leave other details, including the underlying wave front shape assumption, to JMLC to describe and enumerate.
Regards,
WHG

Last edited by whgeiger; 14th June 2012 at 03:14 PM. Reason: typo
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Old 14th June 2012, 04:44 PM   #1339
Jmmlc is offline Jmmlc  France
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Hello,

All Le Cleac'h horns, the axisymetrical ones, the so called Iwata-JMLC and the E-JMLC are hyberbolic horns by that I mean the evolution of the area of their wavefronts (considered as isophase) follow an expression like:

S = So(cosh(x/xo)+T.sinh(x/xo))²


If we only consider the power response and the directly related parameters, Hornresp can be used to simulate the horn.

Then we have the question of the shape and as William said the shape of the e-jmlc horn is not simply described by a profile.

In fact the excel spreadsheet I wrote to calculate the Iwata horns and the E-Jmlc is more than 100Mo and also the spreadsheet is not so easy to use, so it is not public.

The Iwata-JMLC is more straightforward as it only result from the use of an hypothesis made by Iwata San : the ratio curvilinear width over curvilinear height of the wavefront varies linearly with the distance to throat. Also the perimeter of the wavefront at the wall of the horn is defined as

(x/a)²+(y/b)² = 1

with x and y the curvilinear abscisse and ordinate inside the curved wavefront.
(if you faltten the wavefront, the perimeter of the wavefront is an ellipse)

The e-jmlc assumes other hypothesis...

Best regards from Paris, France

Jean-Michel Le Cléac'h
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Old 15th June 2012, 08:54 AM   #1340
Nicolas Davidenko is offline Nicolas Davidenko  France
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Quote:
Originally Posted by franckd View Post
Bonjour Jean-Michel

Si c'est maintenant possible.

FranckD
Those which are interested can contact franckd directly. Other versions are envisaged, but it will be necessary to be a little patient…

Nicolas
Le blog de audiobricolos
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