... lecture hall, exhibition hall, the courts, multi-function hall, studio, auditorium, terminal, hospitals, schools, computer room, art galleries, ... indoor decorative ceiling and interior walls to improve the sound quality, improve speech intelligibility. 2. Main Characteristic1Core ... medium density fiberboard(MDF).2 )Back of board : Sound Fiberglass Mat3) surface finishing : Wooden Veneer, Melamine and ...