Cloud Electronics CX122 - Manual

CX122 Mixer Zoner User Guide
General Description
The CX122 is a versatile mixer-zoner that can be used with confidence as part of a
professional sound system. The impressive performance and flexible routing options, together
with the remote level control facility make it suitable for a wide range of applications. In
addition, the fire alarm mute facility with emergency microphone circuitry make the unit well
equipped to satisfy local authority and fire department requirements. The front panel controls
are easy to understand and simple to operate and the unit can be confidently operated by
unskilled personnel. All the routing, gain and equalisation controls are positioned on the rear
panel, with the exception of the front panel mounted microphone EQ which have removable
shafts.
Input Routing
The two music inputs,together with the microphone input can be routed to the two output
zones with some flexibility. The microphone and Line 1 inputs are permanently routed to Zone
1 output,and in addition, Line 2 input can be routed to Zone 1 by selecting the switch located
on the rear panel. All three inputs can operate through Zone 2 in any combination by selecting
the respective routing switch on the rear panel.
Music Inputs
Music inputs
The two stereo line inputs have a flat frequency response and are suitable for most music
sources such as compact disc players, tape players and radio tuners etc. Inputs are
unbalanced, using RCA phono sockets and the nominal input sensitivity is 0dBu (775mV)
±12dB with an impedance of 100k
Ω.
Gain control
The two stereo line inputs have pre-set gain controls mounted on the rear panel, adjacent to
the input sockets. The range of control is ±12dB. As the nominal input sensitivity is 0dBu
(775mV), the input sensitivity can be varied from -12dBu (195mV) to +12dBu (3.08V) and each
gain control should be set to allow the front panel level controls to have an optimum range of
control.
Front panel level controls
These controls simply set the levels of the music source and the self adhesive labels supplied
with the unit can be positioned above the controls to clearly identify the source.
Priority
Line 1 input has a provision to provide priority over Line 2 input. The priority switch is
positioned on the rear panel adjacent to Line 1 input sockets. When the priority is active, a
signal present on Line 1 will automatically over-ride Line 2. A typical application is where a juke
box signal (Line 1) is required to over-ride the background music signal (Line 2). There is a
delay of approximately 15 seconds before the Line 2 signal is restored. If the factory default
delay of 15 seconds is too long for the application, an internal jumper can be configured for
alternative release times of 6 or 3 seconds.