National Resophonic M-14 ThunderBox resonator guitar- revolver finishThunderbox is the perfect description for the big, powerful voice of the M 14T. That booming sound originates from the M 14s mahogany body, composed of a laminated top and back combined with solid sides. But with its thicker, four inch deep body, the Thunderbox speaks with authority. Its improved low end response combined with the singing high end tone creates a louder, punchier guitar that truly projects. The mahogany neck is capped by an ebony