This five-channel PA system offers the possibility to send music or announcements to five desired zones. The matrix amplifier features four aux and two high level inputs along with two microphone connections of which microphone-1 mutes the other inputs. With the zone selection switches each input could be assigned to each of the five zones. The volume in the individual zone may be controlled centrally with this zone mixer. The system is designed for applications such as paging, announcements, intercommunications, background music, broadcasting in industrial plants etc.