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The construction of a multicell horn
The construction of a multicell horn
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Old 20th January 2009, 09:13 PM   #1
Petter Persson is offline Petter Persson  Sweden
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Default The construction of a multicell horn

I'll try my best to inspire and to show to you that everything is possible. To do a multicellular horn takes a while due to all different moments but they are all kind of nice and it feels good to see the horn grow with every hour of work.

These horns are NOT a Altec 1505B copy. They are pure exponential with a flare frequency of 183 Hz, the same, or at least what was my and reVintages intentions bacause the throat flare in JBL 2441 and 2445.

The horns are built out of 3 mm Baltich Birch plywood, filled with polyester and the outher sides are covered with polyester and glass fibers.

Enjoy
Attached Files
File Type: zip Multicell horn sheet.zip (5.1 KB, 408 views)

Last edited by Pano; 12th April 2018 at 01:40 AM. Reason: added spreadsheet
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Old 20th January 2009, 09:14 PM   #2
Petter Persson is offline Petter Persson  Sweden
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Construction of a mold

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Was later copied so the mold became symmetrical

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Attached Images
File Type: jpg Horn-1.jpg (25.4 KB, 1788 views)
File Type: jpg Horn-2.jpg (35.2 KB, 1863 views)
File Type: jpg Horn-3.jpg (39.1 KB, 1925 views)
File Type: png Horn-4.png (3.3 KB, 1923 views)
File Type: jpg Horn-5.jpg (32.6 KB, 1881 views)
File Type: jpg Horn-6.jpg (29.2 KB, 1727 views)
File Type: jpg Horn-7.jpg (27.3 KB, 1705 views)
File Type: jpg Horn-8.jpg (51.2 KB, 1535 views)
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Old 20th January 2009, 09:15 PM   #3
Petter Persson is offline Petter Persson  Sweden
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Good start

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Some help from a friend

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Attached Images
File Type: jpg Horn-9.jpg (32.6 KB, 1212 views)
File Type: jpg Horn-10.jpg (23.4 KB, 1198 views)
File Type: jpg Horn-11.jpg (23.5 KB, 1241 views)
File Type: jpg Horn-12.jpg (60.2 KB, 1223 views)
File Type: jpg Horn-13.jpg (27.7 KB, 1183 views)
File Type: jpg Horn-14.jpg (29.6 KB, 1371 views)
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Old 20th January 2009, 09:16 PM   #4
Petter Persson is offline Petter Persson  Sweden
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So the cells have zero edge width at their beginning.

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Attached Images
File Type: jpg Horn-15.jpg (35.6 KB, 929 views)
File Type: jpg Horn-16.jpg (30.8 KB, 891 views)
File Type: jpg Horn-17.jpg (22.5 KB, 993 views)
File Type: jpg Horn-18.jpg (36.8 KB, 1079 views)
File Type: jpg Horn-19.jpg (28.9 KB, 967 views)
File Type: jpg Horn-20.jpg (44.7 KB, 930 views)
File Type: jpg Horn-21.jpg (25.4 KB, 892 views)
File Type: jpg Horn-23.jpg (32.2 KB, 919 views)
File Type: jpg Horn-24.jpg (46.3 KB, 1104 views)
File Type: jpg Horn-25.jpg (29.5 KB, 1255 views)
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Old 20th January 2009, 09:18 PM   #5
Petter Persson is offline Petter Persson  Sweden
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One side was taped

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And filled with polyester

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Attached Images
File Type: jpg Horn-26.jpg (38.3 KB, 749 views)
File Type: jpg Horn-27.jpg (31.9 KB, 1014 views)
File Type: jpg Horn-28.jpg (45.0 KB, 1335 views)
File Type: jpg Horn-29.jpg (47.3 KB, 1334 views)
File Type: jpg Horn-30.jpg (43.1 KB, 1136 views)
File Type: jpg Horn-31.jpg (21.2 KB, 1028 views)
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Old 20th January 2009, 09:20 PM   #6
Petter Persson is offline Petter Persson  Sweden
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Construction of adapter

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File Type: jpg Horn-32.jpg (71.6 KB, 748 views)
File Type: jpg Horn-33.jpg (22.3 KB, 732 views)
File Type: jpg Horn-34.jpg (27.5 KB, 611 views)
File Type: jpg Horn-35.jpg (52.7 KB, 708 views)
File Type: jpg Horn-36.jpg (48.8 KB, 743 views)
File Type: jpg Horn-37.jpg (26.7 KB, 843 views)
File Type: jpg Horn-38.jpg (29.1 KB, 796 views)
File Type: jpg Horn-39.jpg (48.2 KB, 760 views)
File Type: jpg Horn-40.jpg (41.8 KB, 890 views)
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Old 20th January 2009, 09:21 PM   #7
Petter Persson is offline Petter Persson  Sweden
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X-mas

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Finish!

Sorry for the filter, the layout is just preliminary and will be changed.

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The crossover at 500 (12 db electrical) and 3000 Hz (6 dB electrical)

Sounds like heaven

If you have any questions/comments please post them and I'll try to answer.



Thanks! / Petter, Sweden
Attached Images
File Type: jpg Horn-41.jpg (26.0 KB, 1009 views)
File Type: jpg Horn-42.jpg (31.5 KB, 1306 views)
File Type: jpg Horn-43.jpg (37.0 KB, 1367 views)
File Type: jpg Horn-44.jpg (20.7 KB, 1411 views)
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Old 20th January 2009, 09:40 PM   #8
WithTarragon is offline WithTarragon  United States
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Excellent Work!!!!!!!!

That was a very nice project. Very, very nice.
I was a bit confused on the throat adapter's construction. I may just need to look at it more closely.

Have you had a chance to make any acoustic measures of the horn, especially the polars?

Thank you very much for posting this
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Old 20th January 2009, 10:26 PM   #9
Helmuth is offline Helmuth  Netherlands
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Looks great Petter,

Thanks for sharing your solution how to construct the horn.
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Old 21st January 2009, 04:10 AM   #10
bear is offline bear
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Very nice work...

If you measure them I'll be curious to see what the real F3 freq works out to be (sans xover), given the mouth size and the flare rate being 183Hz...

I have Altec 1003s, 803s and 203s here to play with... I like that they go to <300Hz. Makes the xover to midbass much better, imho.

One of the real problems with any horn is that there is significant energy there, and the sides of the horn, especially with the thin walls of the multicells (or anything made with thin wood or steel) are not sufficiently stiff... I've had to reinforce the walls of my 203s (for example) which makes a world of difference.

Among the best of the WE and Altec multicells are the ones that are "Tar Filled" - a big hunk of heavy dried asphalt/tar that was moulded around the whole thing... dead and heavy.

So I was wondering what you did about that, if anything with your wood horns. I did notice what looked like some fiberglass over the cells of the completed horn... hard to tell from the pix what it is for?

Btw, they look wonderful!
Nice work...

_-_-bear
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