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Written by David Hancock
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Monday, May 17 2010 13:56 |
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I was wondering if it wouldn't make more sense to do something with the hole similar to what someone would do when designing a speaker and tune the cajon with a port tube. This would make it more of a Helmholtz resonator. The air inside the port tube would resonate and provide a boost in low end frequency depending on the length and diameter of the port. For instance, if the interior volume of the cajon is roughly 1.9 cu. ft. then a 3" inside diameter port with a length of 8.5" would have a tuning frequency of 30 Hz. There would be a 12 decibel per octave roll off below that frequency. At those frequencies it would not matter where the port hole was located as the wavelengths are quite long at those frequencies. I do plan on building one to experiment with this summer. I will be sure to keep you informed of my progress.
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