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CM-CU21 Front Panel Controls & Connections 2
Power LED
The power LED indicates that the unit has power from either of its mains
or DC inputs when it illuminates red. If this indicator is not on when mains
power is connected to the unit, this may indicate a ruptured mains fuse
or a problem with the internal power supply module. The power LED also
indicates when the unit is in setup mode by flashing amber/red.
The power LED brightness is adjusted using the same method as for the
Limit LED.
CM-CU21 Front Panel Controls & Connections
The front panel of the Commentator Unit has all of the commentator inputs
and headphone outputs as well as the microphone power and gain controls.
Phantom Power Select Switches
Each of the three commentator inputs support phantom powered
microphones. The two main commentator positions have dedicated
phantom power switches that enable the 48V supply. The third
Fig 2-4: Front Panel View Of CM-CU21
commentator position has a three way switch that sets the input type.
When the switch is in the bottom position, the input is a line level input.
With the switch in the centre position, the input is for microphones not
requiring phantom power. The top switch position enables the microphone
input phantom power.
Microphone Input Gain Controls
Each of the commentator microphone inputs has an individually adjustable
gain setting. The total gain range of +20dB to +86dB is split into two, to
provide greater accuracy of adjustment. The mic gain switch sets the base
gain value of 20dB or +50dB for the corresponding input. The
associated mic gain potentiometer can then be adjusted to add up to 36dB
of additional gain.
Headphone Outputs
The front panel mounted headphone outputs are via ¼” stereo jack sockets.
The two main commentator positions have locking sockets to prevent the
headphone plug from being accidentally pulled out.
Microphone/Line Inputs
The microphone inputs for the
two main commentators and
the microphone/line level input
for the third position are via 3
pin female XLR-3 connectors
with the following connections:
Pin 1: Ground
Pin 2: Phase
Pin 3: Non-phase
