QSC KC12 - Inputs; Input a; Input B

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Inputs
Input A
a. SIG LED – When illuminated green , it indicates a signal is present.
When illuminated red , it indicates that the A/D converter is being
clipped, and gain should be reduced until no longer flashing red. If this
LED is not illuminated, the input signal is missing or too low to detect.
b. MIC LED – When illuminated amber it indicates the input is configured to
accept a microphone input. When not illuminated, it indicates the input
is configured for a line-level input. You can change the setting through
the Menu. When MIC is selected, the MIC Pre-amp is activated, and
the amber MIC level LED illuminates. The MIC setting should only be
used if a microphone is connected directly to the MIC/LINE input. Note
that the input does not provide phantom power.
c. HI-Z LED – When illuminated yellow it indicates the input is configured
to accept a high impedance input, typically a musical instrument. When
not illuminated, it indicates the input is configured for a line-level input.
You can change the setting through the Menu. It is not recommended
to activate Hi-Z mode without a 6.3 mm (1/4 inch) cable plugged into
input A.
d. GAIN knob – Sets the sensitivity of Input A which controls the signal level sent to the amplifier and the MIX OUT (POST DSP)
output.
e. Combination XLR – 1/4 in. Jack connector – Balanced XLR and 1/4” input. Accepts line-level, MIC-level, or HI-Z inputs.
Select MIC, Line, or HI-Z through the Menu.
Input B
a. SIG LED – When illuminated green , it indicates a signal is present. When
illuminated red , it indicates that the A/D converter is being clipped, and
gain should be reduced until no longer flashing red. If this LED is not
illuminated, the input signal is missing or too low to detect.
b. MIC LED – When illuminated amber it indicates the input is configured to
accept a microphone input. When not illuminated, it indicates the input
is configured for a line-level input. You can change the setting through
the Menu. When MIC is selected, the MIC Pre-amp is activated, and the
amber MIC level LED illuminates. The MIC setting should only be used if
a microphone is connected directly to the MIC/LINE input. Note that this
input can provide +48V phantom power. See next section for details.
c. +48V Phantom Power LED – When illuminated red it indicates the input
is sending +48V of phantom power to connected devices, typically
condenser microphones or active DI boxes. When not illuminated, it
indicates that phantom power is not present. You can change the setting
through the Menu.
CAUTION!: Phantom Power can damage equipment if not
supported.
d. GAIN knob – Sets the sensitivity of Input B which controls the signal level sent to the amplifier and the MIX OUT (POST DSP)
output.
e. Combination XLR – 1/4 in. Jack connector – Balanced XLR and 1/4” input. Accepts line-level or MIC-level inputs. Select
MIC or Line through the Menu.
1
1a
1b
1c
1e
1d
—Figure8—
2
2a
2b
2c
2e
2d
—Figure9—