This integrated 4 zone amplifier and source switcher is designed to power up to 8 speakers and switch between four audio sources. Connection of sources is via 6.35mm jack (microphone), 3.5mm stereo jack, stereo RCA and S/PDIF digital (coaxial or optical). It’s ideal for small businesses looking to provide background music, announcing etc using ceiling or wall speakers. Toslink audio connection is ideal for television audio. A local loop output and headphone jack connection is also provided. Each zone is fitted with its own level control to make adjustments in each area. Power supply included.