Constellation Audio Hercules II - Manual (Page 8)

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5. 20-amp IEC AC socket
Connect the supplied 20-amp AC cord here. You may also
use an aftermarket power cord if you wish.
6. Trigger input
This 3.5mm jack accepts a 12-volt DC on/off trigger signal
from preamps and third-party control systems. When a 12-
volt DC trigger signal is input to the jack, the Hercules II
will turn on. When the trigger signal stops, the amplifier
will turn off.
Controls / displays / indicators
7. Front power/mute switch
The bar running across the front of the amplifier is the power/mute switch. Press on the left end of the bar
and hold it for 3 seconds to turn the amp on and off. Press and release the left side of the bar to activate and
deactivate mute mode.
8. Status indicator LED
This LED shows if the amp is on or off, and also
indicates mute, warm-up, and cool-down
modes. Here are the LED modes:
SOLID RED: Standby mode. Amp is powered
down but ready to use.
FLASHING RED: Cool-down mode. Amp is
powered off but cooling down. The power
button cannot be used in this mode. This mode
lasts 1 minute.
FLASHING GREEN: Warm-up mode. Amp power
is on but amp is warming up and cannot be
used. This mode lasts 1 minute.
SOLID BLUE: On mode. Amp power is on and
the amplifier is fully functional.
FLASHING BLUE: Mute mode. Amp is powered
but will produce no sound.