The term is also used for systems which may additionally have a mixing console, and amplifiers and loudspeakers suitable for music as well as speech, used to reinforce a sound source, such as recorded music or a person giving a speech or distributing the sound throughout a venue or building. The simplest PA systems consist of a microphone, an amplifier, and one or more loudspeakers. Simple and small PA systems  often providing 50 to 200 watts of power and are used in small sites such as school auditoriums, churches and small bars. A sound source such as a Compact Disc player or radio may be connected to a PA system so that music can be played through the system. Some PA systems have speakers that cover an entire campus of a college or industrial site, or an entire outdoor complex (e.g., an athletic stadium). A large PA system may also be used as an alert system during an emergency. We help You choose right products and create system to fit Your needs.