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Multi-Way Conventional loudspeakers with crossovers

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Old 21st November 2012, 02:18 PM   #601
LFM is offline LFM  Canada
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Default something really big

I am going to use wood veneer built up in layers to create a plywood like structure. The material in the mouth and throat will be the more expensive veneer and subsequent layers cheaper. I will purchase sheets of veneer from Tape Ease. To shape, I'll just make a thick template and cut the stacked veneer blanks with a flush cut router bit. By stepping the veneer at the throat and mouth the thickness can be kept very thin. I am sure that if fiberglass resin is used as the glue between layers it will be strong. I'm still trying to find out more about the 1505 profile before starting.
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Old 21st November 2012, 02:19 PM   #602
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I was thinking carbon fibre as a stiffener perhaps? Actually I was thinking of a complete multicell made of it.........mmmmmmmm shiny

Perhaps not

I guess Hahnemuhle rag or some such photo paper could work as the interior of the cell.

Paper questions:

Would newspaper be adequate as a build up medium?
Thick paper in few layers or thin paper in many layers?
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Old 21st November 2012, 02:21 PM   #603
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IIRC, what I used as the paper base was Arches Cold Press Water Color paper, 300 lb. Thick and very stiff. Here it retails for about $2.50 a square foot. Not cheap. But I think you could go with a simple cardstock of similar weight for much less money. And cardstock comes in many colors, so the inside of the cells could be gray, black, white, blue or pink!

The Altec cells are exponential, I believe, so look into that profile.
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Old 21st November 2012, 02:24 PM   #604
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'The WayBack Machine' did a crawl over the DIYAudio page containing Petter Persson's multicells 24th October 2009. The thread was started 20th Jan that year.

Here is the link http://web.archive.org/web/200910240...cell-horn.html

the server holding that info is down at the moment but should be up soon.
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Old 21st November 2012, 02:26 PM   #605
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Be careful with the wet mash. I can really soak into and destroy your base layer. Build a few cells and experiment is the best advice I can give you.

Or do as LFM is doing with thin wood strips of veneer.
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Old 21st November 2012, 02:27 PM   #606
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Quote:
Originally Posted by Pano View Post
if they did not need to be super sturdy like pro horns that are made of metal.
Mine tend to bend at the mouth when I look at them the wrong way. Nice thing is you can easily bend them back.
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Old 21st November 2012, 02:34 PM   #607
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At the smaller size of the 1005 or 803, the metal seems sturdy enough. Might be a good indicator not to go too large with paper!
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Old 21st November 2012, 02:42 PM   #608
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how about adding balsa or carbon fibre (as light but stiffer in 1mm strip) strips along the cells walls?
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Last edited by JRKO; 21st November 2012 at 02:47 PM.
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Old 21st November 2012, 02:49 PM   #609
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Unless you go really big, like Cal's 1803, I doubt you'll have any trouble. Even the metal horns don't weigh much for their size. They are mostly air.

The tar filled versions, on the other hand, are beasts.
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Old 21st November 2012, 03:35 PM   #610
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excellente info!
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