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Multi-Way Conventional loudspeakers with crossovers

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Old 17th November 2012, 12:11 AM   #581
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is the 632hx the cut off for this multicell so I should crossover higher, say 750hz?
No, I just SWAG'd what the lowest practical XO point might be based on its size Vs a smaller and larger multi-cell I'm familiar with.

Without specific dims including the throat adapter, no way to calculate the absolute lowest, but for sure it should handle a 750 Hz XO/2nd order.

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Old 17th November 2012, 12:15 AM   #582
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Just to clarify, do you mean small end or the large end of the cells are not as sharp?
The throats [small end]. The WE/Lansing/Altec multi-cell throats I've seen were honed to a near knife edge, something not practical to do with wood unless it's very hard, which of course might crack over time, so not practical.

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Old 20th November 2012, 11:53 AM   #583
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I think I'll see if the guy can make a pair but get the joint between throat terminations thinner.

Will the increased throat size then become an issue?
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Old 20th November 2012, 10:37 PM   #584
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In theory.......

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Old 21st November 2012, 08:29 AM   #585
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which can be negated if he sands the outside of the throat rather then the inside - man my brain is slow to spot the obvious sometimes
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Old 21st November 2012, 08:49 AM   #586
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How would one go about building a horn like this, where none of the curves are cut from 6" of solid wood with a router?

do you make up shaping blocks and laminate wood or other onto them layer my layer?
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Old 21st November 2012, 10:47 AM   #587
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build a skeleton and clamp thin ply in multiple layers to it....or have a giant steam box and put normal play in and then bend it. I believe he used a circular rasp or sandpaper on a stick to shape the throat. JMLC says the throat is the most important part in terms o distortion caused by reflections.
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Old 21st November 2012, 12:11 PM   #588
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Like this.
Exponential Midrange 2
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Old 21st November 2012, 12:22 PM   #589
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There is flexible ply available:

Lathams Ltd - Flexible Plywood
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Old 21st November 2012, 12:44 PM   #590
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Wow thats some construction there buzzforb. Maybe with the wacky board Charles Darwin just linked to, the hardest part (bending the wood) could be easy?

Also thinking of trying to make a multicell.........
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