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Old 3rd March 2012, 07:40 PM   #11
chrisb is offline chrisb  Canada
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very pretty
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Old 3rd March 2012, 08:16 PM   #12
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Yowza!
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Old 3rd March 2012, 08:47 PM   #13
Nanook is offline Nanook  Canada
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Default Stone turntables...and speakers

as Cal says "Yowza!"

Of course there are always detractors of stone used for almost anything. I can only suggest that with a "batural" shaped stone as in the turntable, there is an opportunity to create stress risers, although they most certainly would not create fissures. The standing waves that could be created can have the effect of "smear" over some unknown frequency range.Granite can be notorious for this. Certainly the 100 lb. mass would minimize it.

Regarding stone loudspeaker enclosures, one ought to proceed slowly and very carefully. I would suggest as a minimum that prototypes be made with painted (both sides) MDF. Get the speaker project "right", then proceed with stone enclosures. I'd also suggest Dynamat or similar on all interior faces to reduce internal reflections. And if the enclosures are not to big or the dimensions could be altered, try for a floorstander (even a somewhat short one), so that having appropriate stands would not be required). You can always fill any cavities with dry sterilized sand, glass shot or lead shot. And make sure the base plate is robust enough to support the weight. Just some thoughts.

This is not that unusual, as the concrete horn loudspeaker thread demonstrates.
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Old 3rd March 2012, 09:28 PM   #14
djn is offline djn  United States
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That is exactly what I ran into when I built the TT. All the cutting and grinding loosened one of the seems and it just let loose. I epoxied it back together then epoxied a 1/4 plate of aluminum on the underside so it would not happen again. The result was a very dead piece as the three different layers of material dampened each other out.

Click the image to open in full size.
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Old 3rd March 2012, 10:16 PM   #15
Tiroler is offline Tiroler  Austria
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This manufacturer is famous for his products: http://www.vroemen.de/steinart1/index.html

For the ambitous DIYer, scroll down a bit on this site: Scan-Speak

I did a kind of a hybrid, works very well! See it here: https://picasaweb.google.com/engrave...ildingSpeakers

Cheers, Martin

Last edited by Tiroler; 3rd March 2012 at 10:20 PM. Reason: spelling
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Old 4th March 2012, 12:50 AM   #16
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I found the AVS forum stone speaker thread:

Amazing stone speakers in the making - AVS Forum
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File Type: jpg stone speaker.jpg (82.8 KB, 105 views)
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Old 4th March 2012, 01:56 AM   #17
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I've made many a stone speaker...



...wait, slight spelling difference.
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Old 4th March 2012, 07:22 AM   #18
chrisb is offline chrisb  Canada
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Quote:
Originally Posted by Cal Weldon View Post
I've made many a stone speaker...



...wait, slight spelling difference.


I see the "d" on your keyboard is still intermittent, and your typing dyslexic, isn't that Dave's specialitee?
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Old 4th March 2012, 04:32 PM   #19
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d? ok, I was thinking r.
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