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Author Topic:  Reso cone material
Tim Tweedale

 

From:
Vancouver, B.C., Canada
Post  Posted 20 Mar 2005 1:32 am    
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A student of mine who has an interest in metallurgy asked me an interesting question; why are resophonic cones made out of aluminum (a poor conductor of sound) rather than a metal which is known for good sound conductivity such as brass? Are there cones made out of brass? Presumably it would be heavier and more expensive to make, but what would it sound like?

-Tim
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Mike D

 

From:
Phx, Az
Post  Posted 20 Mar 2005 7:24 am    
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The 'best sounding' material isn't necessarily the best thing to make the cones out of. Look at the driver material in high end speakers, Aluminum, Kevlar, Fiberglass, Carbon Fiber. None of these materials have much of a tap tone yet they are stiff and light. According to legend, the Dopyera's tried many different metals, and even different alloys of Aluminum before settling on 99% pure stuff. Aluminum is a great combination of lightness and strength, Brass is much heavier and the string energy needed to 'drive' it would be much greater, so it likely would result in a much quieter guitar. Aluminum is also very 'spinnable', unlike other metals such as Titanium, which might be a great cone candidate, if it could be formed.


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Half-assed bottleneck and lap slide player. Full-assed Builder of resonator instruments.
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Rick Aiello


From:
Berryville, VA USA
Post  Posted 20 Mar 2005 10:19 am    
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Quote:
made out of aluminum (a poor conductor of sound)




Sound Velocities

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Aiello's House of Gauss


My wife and I don't think alike. She donates money to the homeless and I donate money to the topless! ... R. Dangerfield


[This message was edited by Rick Aiello on 20 March 2005 at 10:20 AM.]

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HowardR


From:
N.Y.C.-Fire Island-Asheville
Post  Posted 20 Mar 2005 10:33 am    
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Quote:
*No liability is assumed for the results obtained by the use of the above data.



Especially when installing the uranium cone....
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Loni Specter


From:
West Hills, CA, USA
Post  Posted 20 Mar 2005 11:39 am    
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How about wax paper? The kazoobro!
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Jon Light


From:
Saugerties, NY
Post  Posted 20 Mar 2005 11:45 am    
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Combine a comb with that wax paper like any serious kazoo builder would, put three in one guitar and you've got a tricomb.

Hey Rick----you been royally dissed!
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Rick Aiello


From:
Berryville, VA USA
Post  Posted 20 Mar 2005 2:43 pm    
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Hee, Hee ...

I usually don't even comment on reso threads, but ...

I had just been looking at the sonic properties of aluminum oxide (alumina) the other day ... cause some of my guys want their Dustpans anodized ...

So I had that site listing various sound velocities in my "history" folder.

10,000+ meters/sec ... yep, I'm happy with that as a "top coat" ... over a 6000+ m/s inner core.


I saw these too, while searchin' around ...

Tapping Tonewoods ... and ... Velocities of Sound in wood

Interesting reading, although I don't "do wood" ...

PS: That piano site has the velocities in ft/s ... to convert to m/s .... multiply by 0.3048.

------------------

Aiello's House of Gauss


My wife and I don't think alike. She donates money to the homeless and I donate money to the topless! ... R. Dangerfield


[This message was edited by Rick Aiello on 20 March 2005 at 02:46 PM.]

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