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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
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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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File Type: jpg Horn-1.jpg (25.4 KB, 916 views)
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File Type: jpg Horn-3.jpg (39.1 KB, 1020 views)
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File Type: jpg Horn-5.jpg (32.6 KB, 984 views)
File Type: jpg Horn-6.jpg (29.2 KB, 1183 views)
File Type: jpg Horn-7.jpg (27.3 KB, 1176 views)
File Type: jpg Horn-8.jpg (51.2 KB, 1082 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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File Type: jpg Horn-9.jpg (32.6 KB, 796 views)
File Type: jpg Horn-10.jpg (23.4 KB, 830 views)
File Type: jpg Horn-11.jpg (23.5 KB, 855 views)
File Type: jpg Horn-12.jpg (60.2 KB, 835 views)
File Type: jpg Horn-13.jpg (27.7 KB, 796 views)
File Type: jpg Horn-14.jpg (29.6 KB, 928 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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File Type: jpg Horn-15.jpg (35.6 KB, 600 views)
File Type: jpg Horn-16.jpg (30.8 KB, 609 views)
File Type: jpg Horn-17.jpg (22.5 KB, 684 views)
File Type: jpg Horn-18.jpg (36.8 KB, 735 views)
File Type: jpg Horn-19.jpg (28.9 KB, 667 views)
File Type: jpg Horn-20.jpg (44.7 KB, 648 views)
File Type: jpg Horn-21.jpg (25.4 KB, 619 views)
File Type: jpg Horn-23.jpg (32.2 KB, 627 views)
File Type: jpg Horn-24.jpg (46.3 KB, 754 views)
File Type: jpg Horn-25.jpg (29.5 KB, 859 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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File Type: jpg Horn-26.jpg (38.3 KB, 451 views)
File Type: jpg Horn-27.jpg (31.9 KB, 693 views)
File Type: jpg Horn-28.jpg (45.0 KB, 898 views)
File Type: jpg Horn-29.jpg (47.3 KB, 895 views)
File Type: jpg Horn-30.jpg (43.1 KB, 774 views)
File Type: jpg Horn-31.jpg (21.2 KB, 705 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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Attached Images
File Type: jpg Horn-32.jpg (71.6 KB, 474 views)
File Type: jpg Horn-33.jpg (22.3 KB, 485 views)
File Type: jpg Horn-34.jpg (27.5 KB, 405 views)
File Type: jpg Horn-35.jpg (52.7 KB, 474 views)
File Type: jpg Horn-36.jpg (48.8 KB, 493 views)
File Type: jpg Horn-37.jpg (26.7 KB, 574 views)
File Type: jpg Horn-38.jpg (29.1 KB, 537 views)
File Type: jpg Horn-39.jpg (48.2 KB, 508 views)
File Type: jpg Horn-40.jpg (41.8 KB, 604 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, 656 views)
File Type: jpg Horn-42.jpg (31.5 KB, 901 views)
File Type: jpg Horn-43.jpg (37.0 KB, 931 views)
File Type: jpg Horn-44.jpg (20.7 KB, 955 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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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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