QSC Audio GX3 300 User Manual
Page 5
5
EN
GAIN CONTROLS, CH1, CH2
The markings show attenuation in dB. For normal
use, keep the control in the upper half of its
range (less than 10 dB of attenuation). If set
below half, the source may overload before
the amplifier reaches full power.
RACK MOUNTING
Fits standard 19-inch rack, 2RU.
Accepts #10 or 6 mm screws,
as determined by the rack rails.
Add rear support to prevent
damage in portable rigs.
RED CLIP LEDS
Red flashing indicates the amp is being overdriven. Heavy overdrive triggers internal
gain reduction, to reduce overload distortion. Normal gain will resume after the signal
level returns to normal. See Troubleshooting if the red LED remains on continuously.
GREEN SIGNAL LEDS
The green LED starts flashing on soft signals (-35 dB), and changes to steady green as
the signal level increases.
BLUE POWER LED
The blue PWR (POWER) LED indicates that the AC switch is on, and the amp is receiving
power. Within two seconds, it is ready to use.
ALTERNATE GAIN MARKING
When the CROSSOVER switch is active (see rear panel),
LF (CH 1) controls low frequencies (subwoofer),
HF (CH 2) controls the high frequencies (mid-high box).