Crown Audio JBL CSMA 180_1120 - Manual (Page 23)

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3.6 Priority Muting
With CSMA180 and CSMA1120 Input Channel 1 may be used as a priority channel,
muting all other channels when pins 4 and 5 are shorted using a switch closure. If
the amplifier has entered sleep mode due to inactivity, invoking priority will also bring
the unit out of sleep and ready for transmitting an announcement.
The CSMA240, CSMA280 and CSMA2120 lets Input Ch1 operate with priority over all
inputs into Amp 1. Ch1 will have priority over both Amp 1 and Amp 2 if the routing
DIP switch #1 is set to ON. Ch5, however, cannot have priority over the Amp1 inputs.
3.7 Remote Volume Control
Remote volume control can be implemented using a CSR-V controller connected
via an ethernet cable to the RJ45 connector on the back panel. For the CSMA240,
CSMA280 and CSMA2120, there are two connectors, one for each amplifier output.
3.8 Sleep Mode
To save energy, the unit is designed to go into sleep mode after approximately 30
minutes operating with no signal at any of the inputs. Return of signal (-40dBu or
7.75mVRMS) to any input will wake the unit from its slumber. Also, a switch closure
across the priority input pins will return the unit to normal operating mode.
3.9 AUX Output
An auxiliary output is available that you may connect to additional amplifiers. The
audio signal is the mix of the input channels. Note that the master volume control
and tone controls will have no effect on the aux output signal.