While Martin has previously produced a slightly oversized instrument in the form of the D-45S Authentic 1936 inspired by an instrument from the C.F. Martin Museum Collection, this Super Dreadnought (The Super D) is now the largest body size in Martin’s product line. It has an internal air volume approximately twenty percent greater than the standard Dreadnought, which effectively boosts the bass output while maintaining accurate mid and treble frequencies. It also includes a new proprietary bracing pattern to maximize tone and volume. The Super D acoustic testing revealed favorable gains of up to 12dB compared to a standard Dreadnought in a controlled environment. The Super D can achieve an extended dynamic range with more volume and with less effort than any other instrument bearing the C.F. Martin logo. The outward appearance is proportional and remains true to the legendary Dreadnought shape. Standard scale length and standard depth allow this special new design to be easily played by artists of all skill levels and across a multitude of music genres. This model is available with high flame koa or Guatemalan rosewood back and sides.