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Old 24th November 2012, 11:09 AM   #41
xrk971 is offline xrk971  United States
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Originally Posted by VaNarn View Post
The X BOARD PLUS PANELS are available in the 'States from http://purepanel.net/images/Purepanel_Plus.pdf I would not advocate the use of lighter weight materials on basic O.B. speakers as mass and stays are needed to overcome inertial forces created by the reactive forces.
The X Board (Pure Panel) stuff looks really nice, similar to honeycomb composites used in aircraft floorboards (they are made with Kevlar and aluminum honeycomb). Looks pricey though, what does it cost for 3/4 inch panel?
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Old 24th November 2012, 07:36 PM   #42
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As there are various thicknesses and finishes available ,it would be best to contact the suppliers to find out about the price.Alternatively,end users,such as cabinet makers and shopfitters may be able to supply off-cuts,to enable an enclosure to be constructed.Garry Cawsey,the designer of the experimental speaker,mentioned in post#30 found that the thicker panel(58mm) gave the best results as thinner walls required more bracing to meet the same performance.This was for large internal volume enclosures(200 l+).The aircraft industry certainly have come up with brilliant technology for lightweight high stiffness panels and Celestion used just such a honeycomb panel on a small speaker which showed the technique to be worthwhile..
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Old 24th November 2012, 11:09 PM   #43
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paper faced polystyrene foam.
Thanks for the link. I've not seen the polystyrene product paper faced just phenolic and polyisocyanurate.

It this stuff extruded [board] or expanded bead [popcorn], if you don't mind my asking? Looks like an interesting product.
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Old 24th November 2012, 11:50 PM   #44
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Thanks for the link. I've not seen the polystyrene product paper faced just phenolic and polyisocyanurate.

It this stuff extruded [board] or expanded bead [popcorn], if you don't mind my asking? Looks like an interesting product.
Not popcorn, no graininess cuts very smoothly.
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Old 25th November 2012, 05:19 PM   #45
xrk971 is offline xrk971  United States
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Default mini Cornu horn speaker

I just finished the spiral horns, waiting for glue to dry on second one. Foam core makes nice curves as I found out.
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Old 25th November 2012, 06:45 PM   #46
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Nice work! I have so wanted to try those but thought it would drive me crazy. And you work fast too, I like that.
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Old 25th November 2012, 06:54 PM   #47
xrk971 is offline xrk971  United States
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Nice work! I have so wanted to try those but thought it would drive me crazy. And you work fast too, I like that.
Cal, Thanks. This was fun and can be fast if you mod the design to skip the middle separator panel which has to be cut through with a thin slot to hold the walls. Since the Viva TC9FD is smaller I scaled the overall depth back to 2 -3/8 in so it has a thinner profile and doesn't need the middle brace. Not having that middle let's you bend the walls and tack in place with hot melt. I was able to do each in a couple of hours. The final gluing of the top cover with white Elmer's glue is the slowest part. I can't wait to install the drivers and hang them up for a listen. I never imagined that the Cornu spiral horn project could be this fast - it is intimidating when you look at it but is really not that hard.
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Old 25th November 2012, 07:12 PM   #48
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I admire both your candor and humility. You sure have given me something to think about. I have a set of the CSS VWR126's that might be just the ticket.

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Old 25th November 2012, 07:25 PM   #49
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Those are really nice drivers, I would almost feel bad to put $126 drivers in a $3 enclosure. Maybe make at least the front and back panels out of Baltic birch plywood but use foam core for walls... the assembly would still go fast if you skip the divider, you will need to make it deeper though as these are substantially bigger than the 3.5 in dia drivers I used. Good luck!
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Old 25th November 2012, 07:33 PM   #50
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I was thinking about using wood for the front and back and holding them together with bolts inside tubular sleeves. I would need a lot of help with these.
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