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And anyone else into a good light show.

Very interesting. I wish at the end he would have strummed all the strings at once. My acoustic has a natural vibration at A. Whenever I play and hold an A on my bass the A string on the acoustic starts vibrating loudly. Only note that will do that.

Given that an acoustic guitar is a Helmholtz resonator I'd say you found it's resonant frequency.

jps wrote:Given that an acoustic guitar is a Helmholtz resonator I'd say you found it's resonant frequency.

But of course!