The output link is flat when the switch is OFF (the output signal is the same as the input signal), or is high passed when the switch is ON (to connect a satellite speaker).
This switch sets the crossover frequency of the output at 80 Hz or 120 Hz.
This switch reverses the phase of the output signal.
It adjusts the amplifier volume.
3 status LEDs – Power / Signal / Status are provided for monitoring the system.
The IEC AC socket provides IN-OUT connections for the power cable to the socket and additional power link.
The power switch turns the AC power ON and OFF.