Jean Michel on LeCleac'h horns

[Lynn Olson]

For another power factor comparison, here's a comparable-size conical horn (with no radiused edges on the mouth) with a 288 driver. The red line is the reflected power, while the green line is power radiated into the room (as a percentage). As before, these are idealized drivers with no departure from flatness due to the phase plug cancellations or diaphragm breakup. Most of these departures, though, happen at the top of the audio range, where the power factor comparisons between different types of horn converge.

Many, many thanks to Bjorn Kolbrek for all of the many simulations that went into the AH425 - what you see is only a small fraction of the graphs I've been seeing over the last several months. And many thanks again to JMMLC for doing the work he's done.

[David McBean]

Originally posted by Jmmlc
The last versions use a step by step estimation and are much more precise, specially near the mouth.

Just in case anyone was wondering - Hornresp uses the step-by-step estimation technique, rather than the earlier, less accurate method.

Kind regards,

David

[David McBean]

Originally posted by Jmmlc
Try different values of the diameter, T coefficient and Fc until you reach the desired angle.

Hi soongsc,

Hornresp shows the throat flare tangent angle as parameter AT on the main input screen.

S1, F12 and T values for a Le Cléac'h horn can be changed and the effect on AT seen immediately.

Le Cléac'h horn profile data can be exported from Hornresp.

Hope this helps.

Kind regards,

David

[soongsc]

Originally posted by David McBean


Hi soongsc,

Hornresp shows the throat flare tangent angle as parameter AT on the main input screen.

S1, F12 and T values for a Le Cléac'h horn can be changed and the effect on AT seen immediately.

Le Cléac'h horn profile data can be exported from Hornresp.

Hope this helps.

Kind regards,

David

Hi David,

The throat section compresses and expands, and consists of multiple types of curves, part of which Le Cléac'h horn type expansion might be used, it seems not possible to do in Hornresp. Currently I try to get the data of curves contiguous, then look at the BEM results to see how overall wave expansion looks like.

[soongsc]

Does this look interesting?

[Jmmlc]

Hello,

The large horns belong to a friend of the association Mélaudia. He got them quite recently. It was a special order to an enclosures builder.

I only knows that 3 channels digital filtering will be done under Foobar v8

Best regards from Paris,

Jean-Michel Le Cléac'h

Originally posted by pk
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

[Lynn Olson]

Soongsc, more data is needed. It would be nice if the pictures weren't so tiny (being able to read the frequency would be very useful), and there were 3 dB plotlines on the contours to get an idea of the actual magnitude of the falloff with angle. JMMLC horns are not constant-directivity, so the degree of falloff is useful to know.

Without magnitudes, frequencies, knowledge of the horn profile, or diameter of the throat, the pictures don't convey much information. If the simulated driver is a physically unobtainable compression driver with zero throat length, that alone throws off the simulation.

If you have access to the original data, I'd take advantage of the DIYAudio 1000 x 1000 pixel limit and post them one by one.

[Jmmlc]

Hello Angelo,

From my own experience and friend's one, the S2 may be a bit harsh or fatiguing sometime.

I know quite well the Medomex (this is a French loudspeaker from the 60's and 70's and even I have a pair at home - but suspension is worn now). They are good medium loudspeakers but I will never used them in my main system.

Best regards from Paris, France

Jean-Michel Le Cléac'h

Originally posted by angeloitacare
hello Jean Michel

The best i have come up until now is my actual configuration, using in the midrange a LeCleac'h horn, and Vitavox S2 driver. While it does reproduce most music incredibly well, beeing it a real pleasure and relaxing, to spend time, listening to music, there are other things, that i wish, it would do better. Namely voices, specially female voices, have the tendency, sometimes to sound irritating. And there is also a high degree of directivity , and little move of listening position, changes the presentation dramatically ( thats less of a concern for me ). After i compared with the Audax Medomex , ( even not well integrated in the system ) , but in a closed, apropriate box, crossed same as S2, it became clear to me : the Medomex sounds far more natural/neutral - ....

Angelo

[Lynn Olson]

Well, I abused the images in Photoshop and Genuine Fractals, and this was the best I could do. At 3X enlargement, the horn appears to have zero throat diameter - although that would certainly give nice HF dispersion (at 22 kHz!), it would also seem a bit unrealistic.

No apparent throat depth either - is the compression driver assumed to be a point source? That might be valid for an Ionovac or the Acapella ionic driver, but for physical compression drivers with physical diaphragms ...

[pk]

Originally posted by Jmmlc
Hello,

The large horns belong to a friend of the association Mélaudia. He got them quite recently. It was a special order to an enclosures builder.

I only knows that 3 channels digital filtering will be done under Foobar v8

Best regards from Paris,

Jean-Michel Le Cléac'h

Hello Jean-Michel,

Thanks for your reply!

Best regards
Peter