Professional audio system are composed of equipment unit, according to the requirements of designing sound systems, selected equipment used to the discrete devices according to the requirements of the design are connected together to form a complete set can achieve the design requirements of the sound system. For fixed installation system, the equipment should be installed in the cabinet, and to all the system connection in accordance with a certain standard, specification (construction of the relevant norms of weak) for a fixed installation. For mobile systems, such as concerts, open-air performances and other temporary devices, to deal with equipment, cable to take effective temporary fixed measures to ensure its safety.

The connection and installation of the sound system involve many engineering problems, including the design and construction of the sound control room, the pipeline project of the sound system cable, the power supply of the system and so on. This section will focus on these engineering issues. The connection of sound system can be divided into three parts: signal transmission, grounding network and power supply system.