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Old 19th October 2012, 07:57 AM   #2911
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One question.

When resp make a draw of LeCleach horn, for example. Can I just upscale it in graphic soft and make the horn? Is Resp drawing horns with correct dimensions, proportions?
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Old 19th October 2012, 09:33 AM   #2912
NEO Dan is offline NEO Dan  United States
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I guess it would be an accurate visual representation of an axisymmetric (round) horn, but realistically IMO you should make use of the export function to get the dimensional data to build the horn from.
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Old 19th October 2012, 09:45 AM   #2913
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Thanks a lot, only now I realised that profile can be exported also)
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Old 19th October 2012, 04:13 PM   #2914
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Ok, thats horn for 12 inch FR. One pic is resp image, another - xls built curve using exported file from resp, coordinates x nad y.

Both look quite different... Its a bit confusing to start extended woodworking with this)))
Attached Images
File Type: jpg respprofile300.jpg (101.9 KB, 147 views)
File Type: jpg xls_curve.jpg (25.2 KB, 141 views)
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Old 19th October 2012, 04:16 PM   #2915
Mark Kravchenko
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Yep.

Been up against that for quite a while.

Maybe Mr. David could create something that would give us a true representation?
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Old 19th October 2012, 04:24 PM   #2916
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Ok, I am quite gratefull to David for this FREE soft. At list I built a lot of labyrynths with it quite sucessfully, and conus horns also.

For JMLC - I am stuck on the midway. Also simulation of such 220Hz horn shows very smuth roll off to the low end.

Its pic with big volume of rear chamber, without acustic short circuit... Driver is a2 FR, with 95-96Db sensetivity

Even if will get the same curve but with lower SPL than resp shows - I will be still very happy)))
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File Type: jpg resp.jpg (142.3 KB, 140 views)

Last edited by Charcoal; 19th October 2012 at 04:31 PM.
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Old 19th October 2012, 04:57 PM   #2917
Kolbrek is offline Kolbrek  Norway
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Quote:
Originally Posted by Charcoal View Post
Both look quite different...
For LeCléac'h horns, Hornresp has the option to export an "exact profile", which uses an algorithm that is a little different than the original LeCleac'h algorithm, but it will give a horn that is closer to the profile the original algorithm tries to achieve. For simulations, Hornresp uses the original algorithm, and it is probably also used to draw the schematic. If you have answered yes to the question you get when exporting LeCléac'h horn data, you will get a curve that is slightly different from the schematic. If you answer no, you should get the exact representation of the schematic.

Attached is an attempt to illustrate that: I exported the horn data, imported it into excel, and pasted the excel graph on top of the hornresp schematic.

From what I can tell, you have used the "exact" option, since the other option does not extend the rollback further than what is shown in the schematic.

In any case, I would trust the exported data more than the schematic.

mwmkravchenko, have you experienced that there is a mismatch between the schematic and the exported data on a regular basis?

-Bjørn
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File Type: jpg lecCurve.jpg (33.1 KB, 96 views)
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Old 19th October 2012, 05:11 PM   #2918
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Yes, I exported exact profile. On your picture differance is less than on mines.
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Old 19th October 2012, 05:37 PM   #2919
Mark Kravchenko
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Hey there Bjorn

Yes at least as of last time I did a large lecleach design it did not match.
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Old 19th October 2012, 08:52 PM   #2920
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can you show what you built? how than can one built "correct" jmlc horn?

how about response from hornresp, how close it is to real JMLC?
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