The LS6M A.R.E. features a hand-selected premium solid Engelmann Spruce top and Mahogany back and sides. This newly added variation gives powerful low -mid and more open sound. This guitar boasts A.R.E. (Acoustic Resonance Enhancement) is an original wood reforming technology developed by Yamaha. Through precise control of temperature, humidity, and atmospheric pressure, the molecular properties of the wood can be manipulated into a more acoustically ideal condition, similar to the molecular characteristics of woods in instruments that have been played for years.