The LL-TA has an A.R.E.-treated (torrified), solid Engelmann spruce top with solid rosewood back and sides. Modified, non-scalloped bracing retains the L Series’ characteristic bright tone while enhancing the low end. An actuator installed on the inner surface of the guitar back vibrates in response to the vibrations of the strings. The vibrations of the actuator are then conveyed to the body of the guitar and to the air in and around the guitar body, generating authentic reverb and chorus sounds from inside the body. Amazing technology! This is truly an amazing guitar for the price. Every aspect is top quality for longevity and beautiful sound.