Koa
Koa has been used for soundboards since the1920s. This hardwood has a relatively low velocity of sound, considerable density and a low overtone content. Therefore, it tends to produce a solid tone that responds best at the upper end of the dynamic range. Koa has a somewhat more "midrangey" tone that works well for playing rhythm and truly shines in guitars made for Hawaiian-style slide playing.
For back and sides, Koa tends to behave much like mahogany in terms of adding tonal coloration, but its emphasis is again more in the midrange.

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