Tonewoods on the back and sides of a guitar can act as an equalizer, boosting or scooping certain frequencies, or like a reverb unit that adds depth and sustain to the overall sound of the instrument. Mahogany topped acoustic guitars are not especially common but have been around since the ‘20s. The Martin 15 series is a good example of modern mahogany-topped acoustics “It still has the fundamental, strong, direct sound you can expect out of a mahogany guitar with a spruce top — that dry, woody quality,” he explains. Most archtop guitars have spruce tops, so let’s consider what a spruce-topped archtop can sound like when combined with maple or mahogany. Mahogany. The mid-range frequency is the sweet spot for most acoustic Although Mahogany is more commonly found being employed as a back and sides wood, it is used as the soundboard on some models. Compared to a spruce-top mahogany guitar in Taylor’s 500 Series, an all-mahogany steel-string produces a distinctive flavor.