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Old 14th September 2008, 01:40 AM   #11
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Discussion on concrete horns has been split off to here Concrete Horns

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Old 14th September 2008, 02:05 PM   #12
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Hello

Jean-Michel LeCleac'h, what would be the width, height, deep of the Le Cléac'h elliptical and constant horizontal directivity one for 300 or 400 Hz ?

Thanx
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Old 14th September 2008, 02:48 PM   #13
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Quote:
Originally posted by angeloitacare
hi Norris

i know only 3 manufacturers that make elliptical horns. It is quit difficult to make them . One is Haigner from Austria:

http://www.theaudioeagle.com/columns/column03.html
http://www.theaudioeagle.com/photos/...g_daylight.jpg

Nice washing machines.
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Old 14th September 2008, 03:37 PM   #14
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kkkk.....

in my opinion, these look horrible.....
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Old 14th September 2008, 04:20 PM   #15
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Hi,

I would like to present here my Audio System.

My loudspeakers consists, each one, for:

- 12" JBL-D123 speaker, for the mid-bass/bass, installed in a sealed cabinet.
- JBL-2426J compression driver coupled to a JMMLC horns for the midrange.
- Selenium D220Ti compression driver coupled to a JMMLC horns for the treble.

In the black box located behind driver of treble, are the responsible passive components for the alignment and interlacement between the drivers/speaker meet.

My system is bi-amplified.

The sources (CDTransport Theta Pearl/DAC Theta Chroma and turntable Thorens TD-126 MKII/SME-3009R/Ortofon MC-20 Super MKII/Former Audio Note AN-S4II) are connected to a DIY tubes pre-amplifier, which in turn sends the signal to an DIY active 2 way crossover .

This crossover separates bass and subbass, (and also adjust its cutting and intensity using 2 pots) and send this signal to a Sony TAN-5550 solid state power that feeds a sealed subwoofer Dahlquist DQ-1w, 12". The subwoofer Dahlquist it is over there in the back from room, on photo where appears only the loudspeaker.

The other part of the crossover frequencies to send a DIY pure triode power amplifier made especially by myself in order to drive this kind of speakers. All technical characteristics of this power, mainly damping, were carefully designed and prepared to exploit the maximum yield of these compression drivers/horns-speaker.

The final result is a very clean sound, much balanced tone, very dynamic and with highest resolution and soundstage.

Victório Benatti


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Old 14th September 2008, 05:21 PM   #16
JLH is offline JLH  United States
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Angelo,

What T value did you use for these LeCleac'h horns? Did you just use the T=1 or did you try T=0.7 like some other people have tried?

Rgs, JLH
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Old 14th September 2008, 06:43 PM   #17
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hi John

i have choosen a T value ~ 0,8, between hypex and exponential, since i wanted a shorter horn than tractrix ( which follows almost exponential law , T = 1 ). I applied this horn shape on my own new horns, and on Victórios ones. I expected a more natural sound. I am however a little intrigued with the result with the S2. First i used a 6mF cap, but midrange is too strong and forward sounding. With a 3mF cap its a little better, but i observe still too much presence. I guess now its more efficient than the midbass horn. But i will know for shure only, when measuring instruments arrive...might you have a hint what else i could try. To use a even smaller cap value does not seem reasonable to me.
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Old 15th September 2008, 01:39 AM   #18
Xmax BR is offline Xmax BR  Brazil
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Victório e Angelo,

Parabéns pela bela parceria criada!!!

[]´s

Renato - http://www.diyaudio.com.br
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Old 15th September 2008, 07:15 AM   #19
Jmmlc is offline Jmmlc  France
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Hello,


As for the axisymetrical horn there is no equation for the profiles of the new horns. Only we know that the area of the wavefronts (at least near cut-off) follow an expansion according to the general hypperbolic horns equation.

To find the coordinates of the profiles, a similar method to the one used for the axisymetrical Le Cléac'h horn is used for each one of the 36 profiles.


Best regards from Paris, France
Jean-Michel Le Cléac'h



Quote:
Originally posted by TomatoBangBang


Hello Jean Michel

What are the equations of the Le Cléac'h elliptical and constant horizontal directivity ?

Thanx
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Old 15th September 2008, 03:54 PM   #20
sploo is offline sploo  United Kingdom
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Quote:
Originally posted by angeloitacare
On this topic at my forum and on my blog i show step by step, how they are build. It is quit a time consuming task.
Angelo, these horns are superb!

I've been working on some speaker enclosures using a similar technique (stacked MDF run on a lathe).

I see in your photos that you're painting the finished horns. Could you let me know exactly what products you're using?

The only thing I've found that works (that I can get hold of here in the UK) is a two part urethane automotive paint. It takes many coats (as it soaks in) but will eventually give a good surface that can be sanded smooth. The problem is that it's very expensive, and quite dangerous to use.

I've tried many other coatings, and they work to start with, but after a couple of months, you can see the lines where each sheet of MDF joins the next.

You mention polyurethane + a sandable primer. Is this a polyurethane varnish, or some other coating? Is the primer an automotive paint?

Thanks for any info!
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