QSC KC12 - Input C; Outputs

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Input C
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. GAIN knob – Sets the sensitivity of Input C and Bluetooth which controls
the signal level sent to the amplifier and the MIX OUT (POST DSP) output.
c. Bluetooth LED – This LED indicates the status of Bluetooth connection.
When blinking rapidly, the Bluetooth module is searching for a host
device to pair with. When the LED is solid blue the Bluetooth module is
connected to a host device. If the LED is not illuminated, Bluetooth is not
activated.
d. Bluetooth button – This button is used to activate/deactivate Bluetooth
connectivity, and when short-pressed will navigate to the Bluetooth Menu.
For instructions on how to utilize Bluetooth functionality, please see "Menu
Listing" on page 18 of this manual.
e. Stereo 3.5 mm (1/8 in) TRS connector – Accepts line-level stereo input.
Stereo input received at Input C is summed to mono.
4. LIMITER LED – Illuminates red when the built-in limiter is activated to protect and avoid damage to the amplifier or loudspeaker. If
the signal level at any frequency is too high, or the amplifier is too hot, the limiter is activated and the LED is illuminated.
5. POWER LED – Illuminates blue when power is applied to the unit and the ON/OFF switch is in the ON position.
6. STANDBY LED – Illuminates yellow when STANDBY mode is activated. The KC12 is equipped with an automatic standby feature
to conserve energy when the systems are not in use. If no signal is present on any input of a KC12 system the power amplifier will
go into standby and the yellow STANDBY LED will illuminate. No other LEDs will illuminate when the unit is in standby; this includes
both the Rear Power LED and the Front Power LED. In this mode, the amplifier will be powered down. A small amount of voltage
will continue to flow from the AC power source into the power supply of the KC12 power module. This voltage will keep the power
supply and DSP “awake” to reduce turn on time when the system is brought out of standby. The power up time of the amplifier
is negligibly small and is shorter than the latency of the DSP, so no signal will be cut off when the KC12 system is brought out of
standby. A KC12 loudspeaker can also be brought out of standby manually by turning the power switch off and then back on.
7. USB-C 5V 3A connector – For updating the firmware of the KC12 loudspeaker. See "Menu Listing" on page 18 to find where
your firmware version is, and www.qsc.com for firmware updates. This port can also provide up to 5V 3A of power for charging a
phone, tablet, or similar device.
CAUTION!: 1) Do not plug a USB-C cable connected to an external charger into the USB-C port. The KC12 cannot be
powered via this port, and attempting to do so may lead to damage to the product. 2) To avoid a computer acting as an
external charger during a firmware update and subsequent damage to the KC12, you must power on the KC12 before
connecting the USB cable and remove the USB cable from the KC12 before powering down the loudspeaker.
Outputs
1. OUTPUT A is an Analog pass-through XLR that is hard-wired to Input A. The
output signal is the same as the input signal on Channel A. Use this to daisy-
chain loudspeakers with zero latency, or to share the Input A signal to other
audio equipment.
2. OUTPUT B is a Post-DSP Assignable output XLR that outputs at +4 dBu. This
can either be a digital pass-through for Input B, or a select-able digital mix of
Channels A, B, C and Bluetooth. You can make multiple output assignments
within the Display menu, however it will default to Mix Out.
NOTE: This line-level Output B signal is Post Gain, therefore any adjustments made to the input gain of any of the three channels
will affect the output signal.
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3a
3b
3c
3e
3d
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5
6
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—Figure11—
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