Public address systems typically consist of input sources, preamplifiers andor signal routers, amplifiers, control and monitoring equipment, and loudspeakers. Input sources refer to the microphones and CD Players that provide a sound input for the system. More than often this Public Address system is used as voice alarm system that make announcement during emergency to evacuate the occupants in a building.

Public address systems typically consist of input sources, preamplifiers andor signal routers, amplifiers, control and monitoring equipment, and loudspeakers. Input sources refer to the microphones and CD Players that provide a sound input for the system. More than often this Public Address system is used as voice alarm system that make announcement during emergency to evacuate the occupants in a building.