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Multi-Way Conventional loudspeakers with crossovers

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Old 21st November 2012, 09:51 PM   #621
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Pano,
Use RTV two-part silicone for the casting. Have fun.......
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Old 21st November 2012, 10:06 PM   #622
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Quote:
Originally Posted by Pano View Post
My multis are for the 1.4" drivers.
Weren't all multi's a 1.4"?
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Old 21st November 2012, 10:27 PM   #623
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That would be a happy coincidence for me

Would you guys suggest copying a proven existing design or making new one?

I think my issue will be getting the exponential curve sorted. From there I would transfer it to a thick plastic and use that to my sections. I think I'll make up a former out of a dowel with squares threaded over it that correspond to the shape of the horn. That 'should' be easily repeatable (as its not a full replica exponential curve on 4 sides) so I can have several stood in a block of wood and just rotate them to work on the cell and do several at a time

It'll be slow going but there will be minimal clear up and I can do in on the dining table
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Old 21st November 2012, 10:48 PM   #624
Pano is offline Pano  United States
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Quote:
Originally Posted by Cal Weldon View Post
Weren't all multi's a 1.4"?
As far as I know, yes.
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Old 21st November 2012, 11:02 PM   #625
sippy is online now sippy  United Kingdom
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If one could find 'Blue' foam - used to come in 8ft x 4ft sheets, 1, 2 and 4 inches thick - one could 'Hot Wire' the cell's walls with the curve already there AND with feather edges....... one could then 'press' mould a skin on both sides, the press forms being hot-wired from the wall templates.
This technique works REALLY well, tis how a lot of high performance aircraft wing skins are made.
If one can find decent NiChrome wire for the cutting bow, one could cut a form to the inside dims of a cell to support the cell walls on while slopping bonding agents around.
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Old 21st November 2012, 11:40 PM   #626
Pano is offline Pano  United States
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You can get the nichrome cutting wire on amazon.com here in the USA.
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Old 21st November 2012, 11:44 PM   #627
sippy is online now sippy  United Kingdom
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I will have to look into that Pano, thanks for the heads up (been using piano wire, don't have the same non-stick properties though), I can see a Christmas project forming.
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Old 22nd November 2012, 12:39 AM   #628
freax is offline freax  Australia
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Originally Posted by buzzforb View Post
Dunno. Here is some eye candy. Dont kow how they sound, but they look wicked cool.

How is that for a sound room!

Your package goes out today.

SO MUCH WOOD!!!
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Old 22nd November 2012, 12:53 AM   #629
sippy is online now sippy  United Kingdom
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One could even hot wire the compression driver to cell mouth manifold, chop that in half length ways, line with paper, apply glossy finish, bond it back to a whole, fix mounting plates/studs etc, tis only a matter of marking divisions on the templates to 'time in movement' the hot bow to......... same technique as cutting tapered model wing cores.
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Old 22nd November 2012, 01:22 AM   #630
GM is offline GM  United States
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Quote:
Originally Posted by Cal Weldon View Post
Weren't all multi's a 1.4"?
No, the Lansing 800 series [808 thru 1508] were all 1". Only the 808 is fairly well known though due to being part of the Lansing Iconic and later the original horn for the Altec 800 VOTT.

The once thought [by me anyway] just a catalog number 1508:

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