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Multi-Way Conventional loudspeakers with crossovers

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Old 21st November 2012, 03:54 PM   #611
JRKO is offline JRKO
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I know!!! Paper, who'd a thunk it?

now I need to read up on exponential curves. All the calcs I can find are for conical exponential horns, not just the curve.....
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Old 21st November 2012, 03:57 PM   #612
buzzforb is offline buzzforb  United States
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I have one that Le /cleach came up with.

What are the individual horns tuned to? and do these sum into one larger horn with greater frequency extension? Cutoff is determined by horn length, among other things, correct.
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Old 21st November 2012, 06:44 PM   #613
sippy is online now sippy  United Kingdom
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How about carbon and paper?
One should be able to find carbon tissue, looks like glass fibre finish tish' but its black!
Wall paper paste might work as a bonding agent, watery PVA definetly works.... I know this cos I've been moulding bits for model aircraft for the last 30 yrs (I make surfboards and auto-sport pieces now-a-days).
One can also laminate the tish' to 'Wall Lining Foam', use balsa wood strips on the throat and mouth edge, soak the balsa in 'superglue' to make it really hard, use 320grit wet/dry to feather the edges......
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Old 21st November 2012, 07:42 PM   #614
Pano is online now Pano  United States
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How you gonna make the throat? That seems the hardest part to me. You have to go from a square or rectangle where the cells join to round at the driver. Any ideas how to DIY that?
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Old 21st November 2012, 07:48 PM   #615
tinitus is offline tinitus  Europe
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And Now For Something REALLY BIG
maybe
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Old 21st November 2012, 08:29 PM   #616
Pano is online now Pano  United States
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Yes, hadn't thought of that. It could be built up from wood thats shaped to fit.

Hmmm... I have another idea. I could make a few casts of the inside of the throat and send it to whoever wants. From positive that mold you could build up whatever you want around it.
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Old 21st November 2012, 08:40 PM   #617
buzzforb is offline buzzforb  United States
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I would most defintely give it a go.
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Old 21st November 2012, 09:04 PM   #618
sippy is online now sippy  United Kingdom
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For a longer manifold I would use a technique similar to the attached pic.
BUT instead of making the round from polystyrene, I would use a mandrel the size of the throat and slip rings over this, rings would be from ultra high density Pu modelling foam.
Does the spread sheet mentioned/attached to an earlier thread plot the manifold? being able to 'see' the shape is a great aid to making.
I know one thing, it's far easier to actually make it than describe it in words - I might have a go at making one just to see how it goes.
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Old 21st November 2012, 09:41 PM   #619
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Quote:
Originally Posted by Pano View Post
Hmmm... I have another idea. I could make a few casts of the inside of the throat and send it to whoever wants. From positive that mold you could build up whatever you want around it.
Pano are any of your multicells for a 1.4" driver? If not could they just be extended as per the adapters you can buy?

I would definitely like to take you up on your offer
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Old 21st November 2012, 09:44 PM   #620
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My multis are for the 1.4" drivers. I don't mind doing a cast, but I gotta figure out what to do it in. Haven't done anything like that in many years. Plaster? Elastomer? Foam? Rubber? Resin?
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