''A dense tropical hardwood, koa blends midrange focus with extra top-end brightness and chime. The more a koa guitar is played and opens up — especially an all-koa guitar — the more its midrange overtones add warmth and sweetness to its voice.
Koa's tone profile blends the midrange of mahogany with the top end of maple. Due to its density, a new koa guitar tends to start out sounding a little bright and tight, somewhat like maple. But the more a koa guitar is played, the more the sound opens up, expanding the midrange and rewarding the player with a richer, sweeter, more resonant tone.''