The ASM-7 Audio Signal Module combines a 45 Watt amplifier, 2 speaker,s and 2 signal notification appliance circuits (NAC) in one module. The integrated amplifier is fully supervised and protected against overloads. The signal source for the amplifier can be selected by input/output logic equations that are evaluated by the COM-2 Communications Card in the DAB-7 Motherboard. The DAB-7 Motherboard supports ASM-7 module configurations that provide for a one-to-one backup scheme as well as a one-to-many backup scheme.