On 4-5-2014 21:58, LanuHum wrote:
> What is C-holes?

Violins, cellos and other members of the violin family have slots cut 
out in the top plate. These follow more or less the curve of the wall at 
the height of the bridge. They are more ornamented than simple lines 
with round holes at the ends and a thickening in the middle. Giving them 
(at least the left one) more or less the shape of a script 'f'. Hence 
these are called f-holes.
https://en.wikipedia.org/wiki/File:Violinconsruction3.JPG

Apparently older violins/violins da gamba sometimes had c shaped holes. 
Actually you can find one on the wikipedia page of the violin
https://en.wikipedia.org/wiki/Violin
Here they are in the middle of the waist, where it makes sense. The 
image Nekar Xenos referred to was a bit odd in my opinion.

More background: the way sound is generated by a violin is a bit more 
complicated than you might think and is different for high and low 
frequencies. Key components are the Bridge, the sound post that connects 
the top en back plate, more or less under one of the feet of the bridge, 
and the back plate that is thickest precisely where the sound post 
stands, and the fact that the bow make the strings vibrate in such a way 
that the bridge wiggles.
The back plate has a low resonance frequency and the top plate a higher 
frequency. For higher frequencies the major contribution comes from the 
top plate where the left part moves more up and down than the right 
half. Lower frequencies are carried by the entire back plate. And then 
we have the resonance chamber.
In short: a violin is not a symmetric instrument at all. If it would be, 
it would almost produce no sound at all.

If I remember correctly, the f-holes in the cello leave two pieces of 
wood on 'peninsulas' that according to a friend of mine (who builds 
string instruments) are responsible for wolf tones.



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