Quote:
Originally Posted by martinedwards
you have a top that is bigger than the sides...... and is free to resonate (ie. not attached to the sides) so you carve and sand til it resonates at a D. then you glue it to the sides and cut an inch off all the way round......
you want to guess what it'll resonate at, because I haven't got a clue!!
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This is a bit different in that I'm looking at fully assembled guitars.
Today, I sang into three different guitars and measured the resonant frequency of the air cavity.
It was interesting in a few respects:
1) They all resonated strongly at certain pitches, and not at all for others.
2) A parlor resonated at B, one 000 at A sharp, and another 000 at D.
3) I like sound of the one that resonates at D the best.
4) It seems that the air cavity resonates at a lower octave than the open strings. I'm not sure if this is by design, but it seems to keep the sound fairly balanced across the strings.
Question: when I sing into the guitar and cause it to resonate, is it resonating at its Helmholtz frequency? I.e., is it just the air that's getting excited?
I assume that shaving the braces won't have any effect on this resonance frequency.