“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. 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. The Martin 15 series is a good example of modern mahogany-topped acoustics Mahogany topped acoustic guitars are not especially common but have been around since the ‘20s. 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. Compared to a spruce-top mahogany guitar in Taylor’s 500 Series, an all-mahogany steel-string produces a distinctive flavor. 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.