10W metal ceiling loudspeaker with built-in 100V transformer, metal grill, steel fire housing and 6" (152mm) coaxial speaker. For installation in false ceilings or panels. EVAC 6 is with ceramic terminal installed outside the body and thermal fuse. Transformer power tap attenuator is mounted on the top of the body for easy set-up of needed power rating. Main purpose of the speaker are voice alarm systems with background music possibilities.