Cloud Electronics CX122 - Manual (Page 3)

Equalisation
Both output zones have independent treble (HF) and bass (LF) controls and these are
positioned adjacent to the output sockets on the rear panel. The treble control has a range of
±10dB at 10kHz and the bass control has ±10dB at 50Hz. These controls can be used to
provide compensation for differing acoustics or loudspeaker types.
Stereo/Mono Operation
All CX122's leave the factory configured for stereo operation. By configuring circuit jumpers
mounted on the PCB adjacent to the output sockets, each output zone can be configured to
operate in the mono mode. When operating in the mono mode, the output signal is present on
both the left and right output sockets and either or both may be used.
VCA Modules
VCA modules
Local control of the signal level can be achieved on either or both of the zone outputs by fitting
optional VCA modules. These compact modules utilise a pair of industry standard low
distortion VCA's and simply plug into the printed circuit board. The modules can be retro-fitted
but the CX122 would normally be supplied with the modules fitted if specified at the time of
ordering.
Fitting VCA Modules
1. Before commencing any work, the CX122 power cable must be disconnected.
2. Remove the CX122 top panel.
3. The position of the VCA modules is clearly shown on the printed circuit board. Locate the 10
pin male connector, this should have each end pair of pins shorted by single circuit jumpers.
Remove these two jumpers.
4. Carefully position the VCA module on to the 10 pin connector, making sure that both rows of
pins engage with the module mounted socket. This can be verified by checking the alignment
of the 3mm fixing hole. When you are satisfied that the VCA module is correctly fitted, secure
the module with the supplied M3 screw.
5. If you wish to bypass the respective front panel zone level control, the circuit jumpers
adjacent to the respective control can be configured as detailed on the printed circuit board.
This isolates the front panel control from the circuitry, leaving the remote level control to
operate independently.
7. Refit the top panel.
Remote Level Plate
A remote level plate complete with control is supplied with each VCA module and this can be
fitted directly onto a standard UK electrical single gang mounting box (recessed or surface)
with a minimum depth of 25mm (not supplied). Two core screened cable should be used to link
the remote level control to the CX122. When the remote level control facility is being used, it
may be desirable to defeat the front panel zone level control and this can be achieved by
configuring an internal jumper.
REMOTE LEVEL CONTROL WIRING DETAILS
Fire Alarm Interface (Remote Music Mute)
In certain circumstances, there may be a local authority or fire service requirement to mute the