These speaker units have been developed specifi cally for use in emergency and evacuation systems (VES) and each has its own ceramic terminal strip and thermal fuse. These ensure the protection of the line connecting the loudspeakers if a fi re puts one or more of the speaker units connected to it out of use. The C36/6-2EN speaker unit has a loudspeaker with a transformer for constant-voltage lines (50, 70 and 100V). The output power is adjustable (6, 3 or 1,5 W).