Hej Petter ! very nice work indeed ! 5 years ago , i was on the way for the same project ... I finally found a pair of 805 B on ipay 
first reason : smaller have a narrower dispersion for private rooms : i don't have a theater at home .. second reason : copper soldering is easyer than wood working for a later tarfilling .last: a solid throat is very very important as this part gets the hard pressure from driver and shall not twist in any case . The 805 has brass throat that sounds better than aluminium ones ... cheers Pierre, from Paris too
first reason : smaller have a narrower dispersion for private rooms : i don't have a theater at home .. second reason : copper soldering is easyer than wood working for a later tarfilling .last: a solid throat is very very important as this part gets the hard pressure from driver and shall not twist in any case . The 805 has brass throat that sounds better than aluminium ones ... cheers Pierre, from Paris tooHello Petter,
The Onken 15 cells horns are longer and possess a lower acoustical cut-off than the Altec 1505.
Best regards from Paris, France
Jean-Michel Le Cléac'h
The Onken 15 cells horns are longer and possess a lower acoustical cut-off than the Altec 1505.
Best regards from Paris, France
Jean-Michel Le Cléac'h
Petter Persson said:
And every one else
/Petter
Wow! Amazing work Petter. Bravo!
That is very inspiring. Thank you for the lovely pictures and the step-by-step. I especially like the glue ring clamps.
You must be very happy with the sound.
Jean-Michel,
Merci pour la photo. Sacré Hiraga!
I borrowed his 15 cell Altec horns a few times, but I have not seen those Onken. The ceiling horns are great!
That is very inspiring. Thank you for the lovely pictures and the step-by-step. I especially like the glue ring clamps.
You must be very happy with the sound.
Jean-Michel,
Merci pour la photo. Sacré Hiraga!
I borrowed his 15 cell Altec horns a few times, but I have not seen those Onken. The ceiling horns are great!
Yes - very clever! And simple.
The build reminds me a bit of wooden organ pipes.
Always wondered how the vertical joins were done and filled. Now I know! Simple, too. Thanks to Petter for showing us.
BTW, 200 hours of build time @ $20 an hour = $4000 (+materials). Not bad.....
And speaking of home made wooden multicell horns, has anyone else seen this guy in Florida?
http://www.chaudioroom.com/Sculpture.html
http://www.chaudioroom.com/Lportal.html
Beautiful stuff!
The build reminds me a bit of wooden organ pipes.
Always wondered how the vertical joins were done and filled. Now I know! Simple, too. Thanks to Petter for showing us.
BTW, 200 hours of build time @ $20 an hour = $4000 (+materials). Not bad.....
And speaking of home made wooden multicell horns, has anyone else seen this guy in Florida?
http://www.chaudioroom.com/Sculpture.html
http://www.chaudioroom.com/Lportal.html
An externally hosted image should be here but it was not working when we last tested it.
Beautiful stuff!
Hi All!
Sorry it took so long to update.
Thanks for all nice words!
CLS
See here, from page 1, A flat batten, 18 mm thick were mounted on the
throat side of the cells. The curve caused by the cells is quite small, so this
was a convinient approximation so the adapter could be attached.:
So, what´s new? The multicells and Kugelwellenhorns are intact, but the
midbass has been elongated at the throat by 66 mm resulting in higher
compression and smaller rear chamber (30 liters -> 12 liters). The mids were
initially made for 15", but due to economy and availability i had to use my
JBL 2202H instead, and they actually work great.. The longer horn and
smaller rear chamber gives a more direct and punchy sound and than before.
The Multicells and KW-horns were moved back 66 mm to correct phase.
New tapped horns were alse built, only five weeks ago. 400 liter netto, and
500 liters gross volume, using the same driver an in the old tapped horns,
JBL 2202H, the same as in the mids. Frequency response are really nice for
a single fold and they sound terrific with a firm low end which really matches
the rest of the system.
Proud
Simulation, corner placement
http://proxy1.pixbox.se/arkivet/synligt_35/29100000-29109999/640x480/29108702.jpg?0[/IMG
Measurement, 2 pi, outside unsmoothed. Corner placement in room, they have full output down to 25 Hz. Crossed 24 dB/octave at 90 Hz. In the corner, unfiltered, the plateau over 100 Hz is only 3 dB above the 30->70 Hz range, compared to the outdoor measurements 6 dB. The level is not calibrated.
[IMGDEAD]http://proxy1.pixbox.se/arkivet/synligt_35/29280000-29289999/640x480/29281034.jpg?0[/IMGDEAD]
And the final result:
[IMGDEAD]http://proxy1.pixbox.se/arkivet/synligt_35/29160000-29169999/640x480/29167120.jpg?0[/IMGDEAD]
[IMGDEAD]http://proxy1.pixbox.se/arkivet/synligt_35/29160000-29169999/640x480/29167119.jpg?0[/IMGDEAD]
A bit more cosy, but with the old TH:
[IMGDEAD]http://proxy1.pixbox.se/arkivet/synligt_32/26050000-26059999/640x480/26056741.jpg?0[/IMGDEAD]
Due to wide angle lens, it appears that the drivers are not aligned vertically.
This is not true, they are placed straight on top of each other and and
corrected in depth for phase alignment.
[IMGDEAD]http://proxy1.pixbox.se/arkivet/synligt_32/26050000-26059999/640x480/26056735.jpg?0[/IMGDEAD]
I´m a bit prejudiced but it actually is one of the best I ever heard, and so
say people who comes here to:) So, if you´re ever come to Sweden, sen me a pm.
Sorry it took so long to update.
Thanks for all nice words!
CLS
See here, from page 1, A flat batten, 18 mm thick were mounted on the
throat side of the cells. The curve caused by the cells is quite small, so this
was a convinient approximation so the adapter could be attached.:
An externally hosted image should be here but it was not working when we last tested it.
So, what´s new? The multicells and Kugelwellenhorns are intact, but the
midbass has been elongated at the throat by 66 mm resulting in higher
compression and smaller rear chamber (30 liters -> 12 liters). The mids were
initially made for 15", but due to economy and availability i had to use my
JBL 2202H instead, and they actually work great.. The longer horn and
smaller rear chamber gives a more direct and punchy sound and than before.
The Multicells and KW-horns were moved back 66 mm to correct phase.
New tapped horns were alse built, only five weeks ago. 400 liter netto, and
500 liters gross volume, using the same driver an in the old tapped horns,
JBL 2202H, the same as in the mids. Frequency response are really nice for
a single fold and they sound terrific with a firm low end which really matches
the rest of the system.
An externally hosted image should be here but it was not working when we last tested it.
Proud
An externally hosted image should be here but it was not working when we last tested it.
Simulation, corner placement
http://proxy1.pixbox.se/arkivet/synligt_35/29100000-29109999/640x480/29108702.jpg?0[/IMG
Measurement, 2 pi, outside unsmoothed. Corner placement in room, they have full output down to 25 Hz. Crossed 24 dB/octave at 90 Hz. In the corner, unfiltered, the plateau over 100 Hz is only 3 dB above the 30->70 Hz range, compared to the outdoor measurements 6 dB. The level is not calibrated.
[IMGDEAD]http://proxy1.pixbox.se/arkivet/synligt_35/29280000-29289999/640x480/29281034.jpg?0[/IMGDEAD]
And the final result:
[IMGDEAD]http://proxy1.pixbox.se/arkivet/synligt_35/29160000-29169999/640x480/29167120.jpg?0[/IMGDEAD]
[IMGDEAD]http://proxy1.pixbox.se/arkivet/synligt_35/29160000-29169999/640x480/29167119.jpg?0[/IMGDEAD]
A bit more cosy, but with the old TH:
[IMGDEAD]http://proxy1.pixbox.se/arkivet/synligt_32/26050000-26059999/640x480/26056741.jpg?0[/IMGDEAD]
Due to wide angle lens, it appears that the drivers are not aligned vertically.
This is not true, they are placed straight on top of each other and and
corrected in depth for phase alignment.
[IMGDEAD]http://proxy1.pixbox.se/arkivet/synligt_32/26050000-26059999/640x480/26056735.jpg?0[/IMGDEAD]
I´m a bit prejudiced but it actually is one of the best I ever heard, and so
say people who comes here to:) So, if you´re ever come to Sweden, sen me a pm.
Last edited:
"It is quite easy built, just takes a lot of time..."
I both agree and disagree with that.
I´ve built a pair of smaller multicell horns using pretty much the same materials and methods. It wasn´t that hard to make a pair works quite good but when I tried to build a new set that also was supposed to look decent I failed miserably...
I both agree and disagree with that.
I´ve built a pair of smaller multicell horns using pretty much the same materials and methods. It wasn´t that hard to make a pair works quite good but when I tried to build a new set that also was supposed to look decent I failed miserably...
Hello,
I am wondering if the template dimensions or an actual scaled template for the partitions of the cells (long skinny triangles) are available from anyone on the thread?
I have admired this project for some time now and recently made friends with an individual who owns a CNC wood cutting set-up. I would like to get a copy of this template if possible and have a CNC "board template" made to make multiple cuts on a single sheet of ply. Once I have paid for this set up it will be available for anybody who would like to have the partition walls CNC machined from this individual. I will pay for the initial set up fees so subsequent runs will only cost the price of the material and about $15-20 bucks a cut sheet of plywood for the CNC fee (I haven't had him figure the final price b/c there is a bit replacement fee that must be factored in for every 10 sheets run).
First, I need to get a proper template for this project or at least some exact dimensions so I can replicate the design. After this, anybody who might be interested can feel free to contact me and I will be glad to introduce you to the CNC owner. I don't think he would mind if I even posted his contact info directly on the thread but I will ask first.
The CNC machine is located pretty much near the middle of the US in Lawton, OK so shipping shouldn't terribly high either to most places in the US.
Thanks for you assistance with this project, I will post more on this once I have gathered the dimensions I need.
Jeff
I am wondering if the template dimensions or an actual scaled template for the partitions of the cells (long skinny triangles) are available from anyone on the thread?
I have admired this project for some time now and recently made friends with an individual who owns a CNC wood cutting set-up. I would like to get a copy of this template if possible and have a CNC "board template" made to make multiple cuts on a single sheet of ply. Once I have paid for this set up it will be available for anybody who would like to have the partition walls CNC machined from this individual. I will pay for the initial set up fees so subsequent runs will only cost the price of the material and about $15-20 bucks a cut sheet of plywood for the CNC fee (I haven't had him figure the final price b/c there is a bit replacement fee that must be factored in for every 10 sheets run).
First, I need to get a proper template for this project or at least some exact dimensions so I can replicate the design. After this, anybody who might be interested can feel free to contact me and I will be glad to introduce you to the CNC owner. I don't think he would mind if I even posted his contact info directly on the thread but I will ask first.
The CNC machine is located pretty much near the middle of the US in Lawton, OK so shipping shouldn't terribly high either to most places in the US.
Thanks for you assistance with this project, I will post more on this once I have gathered the dimensions I need.
Jeff