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Old 13th October 2008, 07:37 PM   #51
Elbert is offline Elbert  Norway
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And the last graph,

The cone excursion plot, again the Delta-pro in black, and the Kappa in grey.
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Old 4th November 2008, 12:59 PM   #52
Jmmlc is offline Jmmlc  France
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Default Re: Re: Bass horn driver?

Hello,

here is another basshorn just finished to built here in France:

http://img383.imageshack.us/my.php?i...280x768ac0.jpg

the frequency response is here

http://img383.imageshack.us/my.php?i...280x768ky8.jpg

Best regards from Paris, France

Jean-Michel Le Cléac'h



Quote:
Originally posted by Jmmlc
Hello,

There is often a solution for bass horn that is still WAF.

In the attached picture you'll see the (Le Cléac'h) bass horn built by my friend Frédéric Lebas.


Best regards from Paris, France

Jean-Michel Le Cléac'h



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Old 7th May 2013, 02:20 PM   #53
3GGG is offline 3GGG  Australia
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Quote:
Originally Posted by Jmmlc View Post
Hello,

The horn is calculated using the version of my Excel spreadsheet devoted to the calculation of horns delivering quasi cylindrical wavefronts.

http://ndaviden.club.fr/outils/cylind.zip

In the case of that given horn, a lateral wall of the listening room is used as symetry plane.

The geometry of the common curved part between the 2 horn is explained on the graph at:

http://www.revue-audiophile.fr/index.php?q=node/21

few informations in French about the building:
http://www.revue-audiophile.fr/index.php?q=node/15

Best regards from Paris, France

Jean-Michel Le Cléac'h

Can anyone get this spreadsheet to work? I have filled in the coloured cells, in my case 16Hz and 450mm driver diameter? When I go to the sheet for the plotted horn there is nothing and the X and Y axis are in mm?

Any help would be appreciated.
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Old 7th May 2013, 03:03 PM   #54
Jmmlc is offline Jmmlc  France
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Quote:
Originally Posted by 3GGG View Post
Can anyone get this spreadsheet to work? I have filled in the coloured cells, in my case 16Hz and 450mm driver diameter? When I go to the sheet for the plotted horn there is nothing and the X and Y axis are in mm?

Any help would be appreciated.
Hello,

If you downloaded the spreadsheet from Nicolas Davidenko's older website, you have to know that in order to save some kliloctets for the file, the lines of the page "horn_calculation" have been deleted from line 35 to line 4035.

So what you have to do prior to any use of the spreadsheet is to copy (selection + CTRL C ) the line 34 to lines 35 to 4035 (selection + CTRL V).

Best regards from Paris, France

Jean-Michel Le Cléac'h
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Old 7th May 2013, 09:33 PM   #55
DrBoar is offline DrBoar  Sweden
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Elbert I also found that higher Q drivers works better with horns in hifi settings. "kuben horn". I might even go for some more measurements...
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Old 8th May 2013, 11:50 AM   #56
3GGG is offline 3GGG  Australia
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Thanks Jean-Michel, I have the spreadsheet sorted. I now understand why we need to add the data ourselves


Regards

Gregg
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Old 8th May 2013, 12:24 PM   #57
3GGG is offline 3GGG  Australia
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My new project, a bass horn stand, construction will be concrete, Fc 14Hz.
A special thank you to Jean-Michel.
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File Type: png bass behind.png (29.6 KB, 104 views)
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Old 8th May 2013, 06:27 PM   #58
DrBoar is offline DrBoar  Sweden
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I tried various drivers in a "Kuben" similar to Klipsch LaScala but with a 12" driver. I used Dayton Omnimic 50 cm on axis of horn with the horn perched on a chair in the middle of the room, all measurements with same amp setting.

Black trace is Beyma G320 a classical horn driver enormous magnet system giving a Q bellow 0.25 and the Fr is about 60 Hz.
The red trace is an Eminence OEM version with Q of 0.5 and Fr of 50 Hz
The bottom trace is Gamma LA1232 a vintage drivers for very large closed boxes. Vas is 300 liters Fr 25-30 Hz and Q about 0.4. The funny thing is that it despite a mass roll off at 150 Hz or so keeps up to 1 kHz!
In PA the +10 dB sensistivity and higher powerhandling of the Beyma makes it a very good driver. -10 dB is at 90 Hz compared to the output between 200-1000 Hz.

The Gamma driver has a -10 dB at 55 Hz and in a domestic setting the far lower maximal sound level hardly matters.

Click the image to open in full size.

Last edited by DrBoar; 8th May 2013 at 06:28 PM. Reason: forgot the graph!
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Old 8th May 2013, 08:17 PM   #59
GM is offline GM  United States
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Overall, the Beyma driven with either a high output impedance amp or just some series resistance and plenty of power to offset it seems the choice for a HIFI/HT app.

I imagine the Gamma has a low inductance.

GM
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