GAIN x 10: Press the GAIN x10 key and the indicator will illuminate. This indicates the voltage gain of the power amplifier has gone up 10x. Press this key again, the indicator will turn off. This indicates the voltage gain has returned to 1x.
INVERT: Press the INVERT key, the indicator will illuminate. When activated, the power amplifier outputs a reverse phase signal, 180° from the input signal. Press this key again, the indicator will turn off and the power amplifier puts out an in-phase signal that is the same as the input signal.
ON: Press the ON key and the indicator will illuminate. This indicates channel output of the power amplifier has been enabled. If the indicator is blinking, overcurrent or overvoltage protection has been activated.