Hello,
For the bass the best solution is a bass "stand" bass horn as in those pictures
http://www.diyaudio.com/forums/atta...427-jean-michel-lecleach-horns-floor-horn.jpg
and:
http://img209.imageshack.us/img209/7042/estrade31024x768qs8.jpg
Both have been caculated using one of the spreadsheets I designed in order to calculate "quasi cylindrical waves horn".
For what I know there is around half a dozen bass horns of this type having been built here in France. They sound great. This is the best bass sound reproduced by a loudspeaker that I could heard.
See a top view schematics in attached file.
As my listening room here in Paris is quite small I plan to use a corner stand bass horn. See the red contour in the top view schematics (second attached file).
Best regards from Paris, France
Jean-Michel Le Cléac'h
For the bass the best solution is a bass "stand" bass horn as in those pictures
http://www.diyaudio.com/forums/atta...427-jean-michel-lecleach-horns-floor-horn.jpg
and:
http://img209.imageshack.us/img209/7042/estrade31024x768qs8.jpg
Both have been caculated using one of the spreadsheets I designed in order to calculate "quasi cylindrical waves horn".
For what I know there is around half a dozen bass horns of this type having been built here in France. They sound great. This is the best bass sound reproduced by a loudspeaker that I could heard.
See a top view schematics in attached file.
As my listening room here in Paris is quite small I plan to use a corner stand bass horn. See the red contour in the top view schematics (second attached file).
Best regards from Paris, France
Jean-Michel Le Cléac'h
Attachments
Thanks again Jean-Michel. My wife and I are currently looking at building another home on a site in the foothills we own. I like the idea of the bass stand, it seems to fit well and inegrate well with the room. How do you think the bass horn would go if built in as a a bulkhead, so it sits below the ceiling and drops down from there?
I it was to be built down in the slab I assume the step up to the room (to give a flat floor)would not be as effective as the room isnt acting as a mouth anymore?
What drivers have been implemented in the beautiful horns?
Gregg
I it was to be built down in the slab I assume the step up to the room (to give a flat floor)would not be as effective as the room isnt acting as a mouth anymore?
What drivers have been implemented in the beautiful horns?
Gregg
Hello Gregg,
as you can see on the graph
http://www.diyaudio.com/forums/atta...01642563-my-le-cleach-horn-build-basshorn.gif
the floor and the materal walls are used as natiral extension of the horn.
Only some diffraction on the upper front edge of the basshorn diffracts and for what it seems in the case of such bass horn it is not detrimental to the sound.
If the bass hron is in the ceiling, the walls of the room are less efefctive as an extension of the horn, but ceiling horns exist (Jean Hiraga himself uses such: http://t1.gstatic.com/images?q=tbn:ANd9GcR007nSFIk5ZD0JDpq9CZYOeFZkCYk_1Jly422vf3tQCXwXYcL4&t=1 )
The 2 stand bass horns ^previously shown are using Altec 515.
I plan to use myself the magnificient pair of field coil Fertin loudspeakers I own.
Best regards from Paris, France.
as you can see on the graph
http://www.diyaudio.com/forums/atta...01642563-my-le-cleach-horn-build-basshorn.gif
the floor and the materal walls are used as natiral extension of the horn.
Only some diffraction on the upper front edge of the basshorn diffracts and for what it seems in the case of such bass horn it is not detrimental to the sound.
If the bass hron is in the ceiling, the walls of the room are less efefctive as an extension of the horn, but ceiling horns exist (Jean Hiraga himself uses such: http://t1.gstatic.com/images?q=tbn:ANd9GcR007nSFIk5ZD0JDpq9CZYOeFZkCYk_1Jly422vf3tQCXwXYcL4&t=1 )
The 2 stand bass horns ^previously shown are using Altec 515.
I plan to use myself the magnificient pair of field coil Fertin loudspeakers I own.
Best regards from Paris, France.
Check this thread where the hornbuiling has just begun. The horn is almost finished now though. Drivers are JBL 2204.
HiFiForum.nu - Murat riktigt bashorn
HiFiForum.nu - Murat riktigt bashorn
Hello 3GGG,
It is not necessary to make the bass horn firing toward the listener. In the famous french magazine "L'Audiophile" Jean Hiraga used to analyze the loudspeakers system of mister Tamaru, which one uses bass horns incoprorated through the ceiling. (both mister Kaneda sytem and Jean Hiraga system are using bass horns in the ceiling inspired directly by Tamaru's system.
see:
Le systme de Mr Tamaru (J.Hiraga)
Hiraga said that a great advantage of that configuration is that, according that the HF frequencies are more directive than the low frequencies, the distortion components emitted by the bass horn cannot arrive to the listener ears.
Best regards from Paris, France
Jean-Michel Le Cléac'h
It is not necessary to make the bass horn firing toward the listener. In the famous french magazine "L'Audiophile" Jean Hiraga used to analyze the loudspeakers system of mister Tamaru, which one uses bass horns incoprorated through the ceiling. (both mister Kaneda sytem and Jean Hiraga system are using bass horns in the ceiling inspired directly by Tamaru's system.
see:
Le systme de Mr Tamaru (J.Hiraga)
Hiraga said that a great advantage of that configuration is that, according that the HF frequencies are more directive than the low frequencies, the distortion components emitted by the bass horn cannot arrive to the listener ears.
Best regards from Paris, France
Jean-Michel Le Cléac'h
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Hey 3....
I have used my own Hypex optimizer (100% according to Marshall Leach AES articles). I don´t know how David made his, but this one, in my opinion, works better.
The horn is designed for 0,75*Pi due to the shape and size of the room. But feel free to adjust to 4=1,0*Pi or 8=0,5*Pi in the spreadsheet.
So first use the spreadsheet to get input data, then run Hornresp.
In this case you can just import the 2204.txt file into Hornresp and you´re done.
I have used my own Hypex optimizer (100% according to Marshall Leach AES articles). I don´t know how David made his, but this one, in my opinion, works better.
The horn is designed for 0,75*Pi due to the shape and size of the room. But feel free to adjust to 4=1,0*Pi or 8=0,5*Pi in the spreadsheet.
So first use the spreadsheet to get input data, then run Hornresp.
In this case you can just import the 2204.txt file into Hornresp and you´re done.
Last edited:
Hi Lars,
Some observations...
For identical inputs, the calculated Hornresp and subbashorn.xls spreadsheet results are effectively the same. The formula used to calculate system Vas in your spreadsheet is an approximation only - that is why there are slight differences in our results.
The spreadsheet assumes that the Mmd value in Hornresp will be the same as the driver Mms value. This is not the case.
Your spreadsheet requires the user to initially nominate values for m, Fl and Fh and then manually optimise to achieve an acceptable result. Hornresp does this automatically.
Kind regards,
David
I don't know in your country, but maibe you find thicker mdf sheets, above 18mm. that will reduce the number of rings, and subsequently less work.
its a bloddy pain to work the very thick MDF
actually, around the mouth section it would make sense to use even less thick MDF
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