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Old 22nd January 2009, 07:59 AM   #21
coresta is offline coresta  France
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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
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Old 22nd January 2009, 08:06 AM   #22
Jmmlc is offline Jmmlc  France
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Hello 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

Quote:
Originally posted by Petter Persson


And every one else this Onken, is it simular to the Altec 1505B? The roof horns are awsome! *Want a house...*

/Petter
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Old 22nd January 2009, 05:46 PM   #23
Pano is offline Pano  United States
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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!
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Old 22nd January 2009, 06:08 PM   #24
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Quote:
Originally posted by panomaniac
I especially like the glue ring clamps.
I'm with you on that one Michael, commonplace for others but a stroke of genius to me.
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Old 22nd January 2009, 09:13 PM   #25
Pano is offline Pano  United States
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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
Click the image to open in full size.
Beautiful stuff!
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Old 24th January 2009, 07:51 AM   #26
vuki is offline vuki  Croatia
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Bravo Petter! You are making it look so easy to do. Wonderfull!
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Old 6th June 2009, 01:11 PM   #27
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Hi,

Could you provide the horn profile?

Tim
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Old 6th June 2009, 02:49 PM   #28
GWEE is offline GWEE  United States
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this is one of the coolest things i have ever saw.....
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Old 7th June 2009, 05:57 PM   #29
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Yes it would be nice to have an update on these. I am still in awe Petter.
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Old 10th October 2009, 09:21 AM   #30
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Hi All!

Sorry it took so long to update.

Thanks for all nice words!

CLS
Quote:
One question: I saw it's a curved 'surface' where the multi-cell joint together near the throat. However the adaptor between horn and driver has 2 flat flanges. How is the conversion between the curvy side and the flat side?
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.:
Click the image to open in full size.



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.

Click the image to open in full size.

Proud
Click the image to open in full size.

Simulation, corner placement

[IMG]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.

Click the image to open in full size.


And the final result:


Click the image to open in full size.

Click the image to open in full size.


A bit more cosy, but with the old TH:

Click the image to open in full size.

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.

Click the image to open in full size.


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 by Petter Persson; 10th October 2009 at 09:48 AM.
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