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Old 23rd May 2012, 07:04 PM   #11
castorG is offline castorG  Italy
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Don't you think it would affect the sound?
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Old 23rd May 2012, 07:04 PM   #12
chrisb is offline chrisb  Canada
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Originally Posted by sippy View Post
Just a thought...........
Think of a ring of wood, multiples stacked to make a cylinder, to cut this using cnc / laser is wasteful........
Divide each ring into segments, glue the segments so the joints at say 45deg to each other, from curves to strait sections can be formed as 'J' sections, the majority of the straits can then be cut on a table saw. Yes its slightly more complex to make / glue up a horn enclosure in this manner.
Thinking about it a little more, one could have just the curved sections cnc/laser'd and flat material joined in to make the strait sections........BIG saving in cost there.

start doing the math on the programming, machining and assembly time for the tight nesting required for high yield on any curved shape, and most particularly horns such as these, and you quickly gain appreciation for rubberply / Kerfore and vacuum bagging

no matter how you do it - CCM
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Old 23rd May 2012, 07:08 PM   #13
chrisb is offline chrisb  Canada
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Don't you think it would affect the sound?

not detrimentally so, compared to the diffraction effects at edges of front baffles cabinet
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Old 23rd May 2012, 07:26 PM   #14
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does this look approximate to kirishima's tuning/performance?

its got a AN super 8 neo in this sim. if this is approx, i'll put the numbers into the MJK worksheet.

Click the image to open in full size.
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Old 23rd May 2012, 07:39 PM   #15
castorG is offline castorG  Italy
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Never been able to make 'hornresp' work..

Gafhenderson, could you make a similar spl response for the fe206en into the dallaII? Of course only if it does not take too much time to do so, otherwise don't consider my question.

Ervin
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Old 23rd May 2012, 09:04 PM   #16
sippy is offline sippy  United Kingdom
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start doing the math on the programming, machining and assembly time for the tight nesting required for high yield on any curved shape, and most particularly horns such as these, and you quickly gain appreciation for rubberply / Kerfore and vacuum bagging no matter how you do it - CCM
true enough Chrisb, the other way, if cost is 'no object' would be to buy veneer and bag over forms, a friend and i did this a few years ago to make a small run of custom skateboard decks, though in the end it turned out easier to make them with an ultra high density foam core, Pu at 240kg m/3, skinned in glass/carbon.
On my 'to do' list is a pair of 'bookshelf' speakers for my bedroom using this foam, though I've got to get the Emken out the way first

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Old 23rd May 2012, 09:04 PM   #17
sippy is offline sippy  United Kingdom
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the link didnt post

http://www.homeblown.co.uk/HD/
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Old 23rd May 2012, 09:15 PM   #18
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Very pretty - in fact it already has been done with the Austin:
Click the image to open in full size.
That is actually a variation on Dallas II. I'm pretty sure that Ron had little or no input into that one, unlike the Austin 166 that layertone did.

dave
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Old 23rd May 2012, 09:21 PM   #19
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all i know is that it's a laser, and it needs to be special treated wood that is suitable for use with lasers.
I talked with a fellow that had access to that CNC techto do FH flat-paks and we decided that the materials limitation made it impractical to proceed.

dave
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Old 23rd May 2012, 09:24 PM   #20
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Chrisb, what do you think abouy simply taking off the head of the dallas II? I guess it want be detrimental from a sound point of view, since the dallas III does the same thing.
I would do that as a matter of course -- removing all of the redundant voids. Taking the big chunk off the front should decrease the diffraction signature.

dave
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