The Bogen Communication CSD2X2 Speakers are constructed for use with 25/70 V commercial public address systems. Quick and easy to install, the 2 ft x 2ft drop-in ceiling speakers are designed for 2 ft x 2ft as well as 2 ft x 4 ft ceiling frames. The Bogen Communication CSD2X2 Speakers feature a finely perforated grille in the front for protecting the speaker elements. The industrial grade protective steel back of these Bogen Communication speakers conceals and protects the exposed drivers at the rear end. The recessed volume control in the front of these Bogen Communication speakers allows you to adjust the volumes with ease. For an exact fit in any drop ceiling, these drop-in ceiling speakers come with a tile support rail. The full range Bogen Communication CSD2X2 Speakers deliver a frequency range of 95 Hz to 20 KHz to deliver a loud and accurate sound.