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PostPosted: Fri Nov 25, 2011 1:10 am 
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Koa
Koa
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Joined: Mon Sep 05, 2011 10:45 pm
Posts: 1483
First name: Trevor
Last Name: Gore
City: Sydney
Country: Australia
Focus: Build
Status: Professional
Alan Carruth wrote:
It looks to me as though guitar soundhole size is chosen in part to maximise the output in that 3kHz range, which will help with 'projection' and 'clarity'. Maybe.

Thanks Alan. My rather badly posed question was about whether you thought the 1.5kHz lift fitted a singers formant. I think Jansson did a lot on singer's formants. I should go look it up! I've not been able to find any higher frequency "formants" as such in guitars, other than the 1.5kHz lift as previously mentioned and the 4.0kHz lift which I think is that coincidence frequency thing.
Alan Carruth wrote:
I'd be interested in that radius formula. Could it have come from Helmholtz?

I've searched "On the sensations of tone" previously, looking for the radius formula. Didn't find it, but it's a big book!

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Trevor Gore, Luthier. Australian hand made acoustic guitars, classical guitars; custom guitar design and build; guitar design instruction.

http://www.goreguitars.com.au


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PostPosted: Fri Nov 25, 2011 2:55 pm 
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Koa
Koa

Joined: Sun Jun 21, 2009 2:40 pm
Posts: 505
First name: David
Last Name: Malicky
City: San Diego
State: CA
Zip/Postal Code: 92111
Country: USA
Focus: Build
Status: Amateur
Tom West wrote:
Trevor: I think I recall seeing that formula on the MIMF but I can't bring back the name of the author or the name of the thread itself.
Tom

Maybe it was this post (about 2/3 down)--
Robert Callaghan - 02:21pm Aug 2, 1998
in this thread--
http://www.mimf.com/archives/body_size.htm

But still no book reference for the 1/4 nugget.

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