Re: Re: Re: Bass horn driver?
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
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
nuconz said:
Re: Re: Re: Re: Re: Bass horn driver?
Hello,
That's a lot of work you ask me. Unfortunately I am very busy and it will take time to do.
The spreadsheet is really easy to use, even if you give me the diameter of the driver you'll plan to use and the width of the room where the horn should be built, I can calculate the horn for you.
Best regards from Paris, France
Jean-Michel Le Cléac'h
Hello,
That's a lot of work you ask me. Unfortunately I am very busy and it will take time to do.
The spreadsheet is really easy to use, even if you give me the diameter of the driver you'll plan to use and the width of the room where the horn should be built, I can calculate the horn for you.
Best regards from Paris, France
Jean-Michel Le Cléac'h
nuconz said:
Re: Re: Re: Re: Re: Re: Bass horn driver?
12" driver & i don't have parameters yet, but will this week after the DVM arrives that reads millivolts.
can you describe the horn design (folded, exponential, TL, TH, sealed cabinet, BR, etc) ? it appears to have a rounded back, or is this just part of the decoration? and what are the bandwidth, SPL, impedance, power requirements, etc.? thanks.
Jmmlc said:
12" driver & i don't have parameters yet, but will this week after the DVM arrives that reads millivolts.
can you describe the horn design (folded, exponential, TL, TH, sealed cabinet, BR, etc) ? it appears to have a rounded back, or is this just part of the decoration? and what are the bandwidth, SPL, impedance, power requirements, etc.? thanks.
Re: Re: Re: Re: Re: Re: Re: Re: Re: Bass horn driver?
Hello,
Each one of the 2 channels use an Altec 515.
The rear volume (closed enclosure) for the Altec 515 was optimzed using Hornresp (specially a reduction of phase in the range 30Hz-100Hz was looked for).
Here is a picture of the building of the rear volume.
Best regards from Paris, France
Jean-Michel Le Cléac'h
Hello,
Each one of the 2 channels use an Altec 515.
The rear volume (closed enclosure) for the Altec 515 was optimzed using Hornresp (specially a reduction of phase in the range 30Hz-100Hz was looked for).
Here is a picture of the building of the rear volume.
Best regards from Paris, France
Jean-Michel Le Cléac'h
nuconz said:
Attachments
Hi Elbert,
Mine gym teacher in high school had RT2 in his basement together with some front loaded horn + Decca horns on top. The bass drum on these, was like being kicked in the chest by a mule.
Not much low bass though. As for the elements used, except for Decca, I have no clue. It's 30 years ago
Excuse for ranting, couldn't resist
Good luck!
Peter
Mine gym teacher in high school had RT2 in his basement together with some front loaded horn + Decca horns on top. The bass drum on these, was like being kicked in the chest by a mule.
Not much low bass though. As for the elements used, except for Decca, I have no clue. It's 30 years ago
Excuse for ranting, couldn't resist
Good luck!
Peter
Oh dear, looks like my "modest" RT-2 horn has been overtaken by some serious French project!
Anyway, very interesting reading although it is well beyond my scope of ambition, not to mention living-room space!
Interesting to hear your recollections of your experience with these horns Peter!
The "mule kick" sounds most encouraging, but lack of low bass perhaps a bit disappointing again...
Anyway, the woofer is ordered and the MDF has been cut, so I can only hope for the best now!
Ah, speaking of which, back to the original topic.. The driver i finally settled for was the Eminence Delta-pro 12.
In the simulations I did, it showed less ripple and slightly better low frequency extension than the Kappa with comparable efficiency. It also seemed to be a perfect match to the closed rear chamber with the cone excursion rolling off and flattening out at 30 Hz, still well below maximum driver excursion.
I'll try and do some photo's during the build process and see if i can post them under a new thread in due time!
Enclosed is the response of the Delta-pro sim compared to the Kappa-pro in grey..
Anyway, very interesting reading although it is well beyond my scope of ambition, not to mention living-room space!
Interesting to hear your recollections of your experience with these horns Peter!
The "mule kick" sounds most encouraging, but lack of low bass perhaps a bit disappointing again...
Anyway, the woofer is ordered and the MDF has been cut, so I can only hope for the best now!
Ah, speaking of which, back to the original topic.. The driver i finally settled for was the Eminence Delta-pro 12.
In the simulations I did, it showed less ripple and slightly better low frequency extension than the Kappa with comparable efficiency. It also seemed to be a perfect match to the closed rear chamber with the cone excursion rolling off and flattening out at 30 Hz, still well below maximum driver excursion.
I'll try and do some photo's during the build process and see if i can post them under a new thread in due time!
Enclosed is the response of the Delta-pro sim compared to the Kappa-pro in grey..
Attachments
Re: Re: Bass horn driver?
Hello,
here is another basshorn just finished to built here in France:
http://img383.imageshack.us/my.php?image=dsc30511280x768ac0.jpg
the frequency response is here
http://img383.imageshack.us/my.php?image=dsc30371280x768ky8.jpg
Best regards from Paris, France
Jean-Michel Le Cléac'h
Hello,
here is another basshorn just finished to built here in France:
http://img383.imageshack.us/my.php?image=dsc30511280x768ac0.jpg
the frequency response is here
http://img383.imageshack.us/my.php?image=dsc30371280x768ky8.jpg
Best regards from Paris, France
Jean-Michel Le Cléac'h
Jmmlc said:
Attachments
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
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.
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.
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