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The construction of a multicell horn
The construction of a multicell horn
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Old 20th January 2009, 08:13 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, 109 views)

Last edited by Pano; 12th April 2018 at 12:40 AM. Reason: added spreadsheet
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Old 20th January 2009, 08:14 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, 1081 views)
File Type: jpg Horn-2.jpg (35.2 KB, 1158 views)
File Type: jpg Horn-3.jpg (39.1 KB, 1225 views)
File Type: png Horn-4.png (3.3 KB, 1245 views)
File Type: jpg Horn-5.jpg (32.6 KB, 1196 views)
File Type: jpg Horn-6.jpg (29.2 KB, 1435 views)
File Type: jpg Horn-7.jpg (27.3 KB, 1416 views)
File Type: jpg Horn-8.jpg (51.2 KB, 1286 views)
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Old 20th January 2009, 08:15 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, 947 views)
File Type: jpg Horn-10.jpg (23.4 KB, 991 views)
File Type: jpg Horn-11.jpg (23.5 KB, 1027 views)
File Type: jpg Horn-12.jpg (60.2 KB, 1011 views)
File Type: jpg Horn-13.jpg (27.7 KB, 966 views)
File Type: jpg Horn-14.jpg (29.6 KB, 1126 views)
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Old 20th January 2009, 08:16 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, 708 views)
File Type: jpg Horn-16.jpg (30.8 KB, 718 views)
File Type: jpg Horn-17.jpg (22.5 KB, 810 views)
File Type: jpg Horn-18.jpg (36.8 KB, 878 views)
File Type: jpg Horn-19.jpg (28.9 KB, 787 views)
File Type: jpg Horn-20.jpg (44.7 KB, 761 views)
File Type: jpg Horn-21.jpg (25.4 KB, 729 views)
File Type: jpg Horn-23.jpg (32.2 KB, 747 views)
File Type: jpg Horn-24.jpg (46.3 KB, 900 views)
File Type: jpg Horn-25.jpg (29.5 KB, 1030 views)
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Old 20th January 2009, 08:18 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, 531 views)
File Type: jpg Horn-27.jpg (31.9 KB, 819 views)
File Type: jpg Horn-28.jpg (45.0 KB, 1079 views)
File Type: jpg Horn-29.jpg (47.3 KB, 1077 views)
File Type: jpg Horn-30.jpg (43.1 KB, 923 views)
File Type: jpg Horn-31.jpg (21.2 KB, 832 views)
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Old 20th January 2009, 08:20 PM   #6
Petter Persson is offline Petter Persson  Sweden
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Construction of adapter

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Attached Images
File Type: jpg Horn-32.jpg (71.6 KB, 567 views)
File Type: jpg Horn-33.jpg (22.3 KB, 582 views)
File Type: jpg Horn-34.jpg (27.5 KB, 485 views)
File Type: jpg Horn-35.jpg (52.7 KB, 566 views)
File Type: jpg Horn-36.jpg (48.8 KB, 592 views)
File Type: jpg Horn-37.jpg (26.7 KB, 683 views)
File Type: jpg Horn-38.jpg (29.1 KB, 641 views)
File Type: jpg Horn-39.jpg (48.2 KB, 610 views)
File Type: jpg Horn-40.jpg (41.8 KB, 719 views)
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Old 20th January 2009, 08:21 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, 786 views)
File Type: jpg Horn-42.jpg (31.5 KB, 1074 views)
File Type: jpg Horn-43.jpg (37.0 KB, 1113 views)
File Type: jpg Horn-44.jpg (20.7 KB, 1151 views)
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Old 20th January 2009, 08:40 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, 09:26 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, 03:10 AM   #10
bear is offline bear
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The construction of a multicell horn
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...

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