That is to say that they allow tonal characteristics of the top to be heard without the addition of extraneous coloration and may even serve to attenuate some of the overtones emanating from the top. "Maple and walnut tend to be more acoustically transparent than other tonewoods, due to a low velocity of sound and a high degree of internal damping. Everything else being equal, it is generally recognized that mahogany and koa will produce a "warmer" sound in a guitar than the more brittle rosewoods can." Heavy koa, mahogany and walnut are all comparable in their tone. "The denser and more brittle the wood, the more it will ring the lighter and looser the wood is, the more it will be an acoustically passive part of the guitar. Here is Ervin Somogyi's take on walnut, koa and mahogany
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