The drop-in ceiling speaker, CSD2X2CA Ceiling Tile Speaker from Bogen comes with 4 watt multi tap transformer with a rotary switch for power tap selection. Its frequency response range is 110Hz to 20kHz. It also features a 8 main cone and secondary high frequency cone. Its one-piece assembly design makes installation a breeze. Other characteristics include perforated grille, rail crossbar support and a fully enclosed, industrial grade steel construction.