Today, with the development of public and private communities, the need to transmit of sound in the industrial, administrative, commercial, educational and religious areas has been considered more than ever which defines in different ways of paging, broadcasting the rituals and music. Generally speaking, PA systems are based on receiving and amplifying the sound of a person or an audio source through various electronic devices; eventually it will be distributed through various speakers.
he sound system devices include a variety of microphones, mixers, amplifiers, and speakers, each of which has specific features to meet the needs of different weather conditions, locations, the required sound pressure levels (SPL), the distance or proximity of equipment etc.