- PGM input 4CH & output 4CH
- In case of fire, PEX-4 receives signal of fire from the receiver, and send out the emergency announcement automatically
- Remote input for controlling and broadcasting remotely
- In case of fire, the local amplifier will be off and external input will be broadcasted through AMP OUT terminal
- Automatically convert to main broadcasting from local broadcasting once the amplifier's output (100V) is in