2
CX233 I
NSTALLATION AND OPERATION MANUAL
1
General Description
The CX233 is a versatile multi-source 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, emergency microphone mode and
DC power supply option make the mixer/zoner well equipped to satisfy local authority and
fire department requirements.
2
Music Inputs
2.01
Music Inputs
All three line inputs have a flat frequency response and are suitable for most music
sources such as compact disc players, tape players and tuners etc. Unbalanced signals
make use of RCA phono sockets and balanced inputs use XLR connectors. The nominal
input sensitivity is 0dBu (775mV) ñ12dB.
2.02
Gain Control
All music inputs have pre-set gain controls mounted on the rear panel adjacent to the
input connectors. The range of the control is ñ12dB. As the nominal input sensitivity is
0dBu (775mV), the input sensitivity can be varied from -12dBu (195mV) to +12dBu
(3.08V) and this gain control should be set to allow the front panel level controls to have
an optimum range of control.
2.03
Front panel level controls
These controls simply set the level of the music source assigned to a particular input
channel. There is a provision to apply a self adhesive label above the control, to clearly
identify the source.
2.04
Priority
Line 1 input has a provision to provide priority over line inputs 2 and 3. The switch is
positioned to the right of the line 1 zone select switches and is marked "PR". When the
priority is active, and a signal present on line 1 this will automatically override line inputs 2
and 3. A typical application for line 1 input priority is where a juke box signal is required
to override the background music signal. There is a delay of approximately 20 seconds
before any signals present on lines 2 and 3 are restored. This delay will be sufficient to
prevent short bursts of background music during title changes.
3
Microphone Inputs
3.01
Mic Inputs
Two microphone inputs are provided and the microphone amplifier is an electronically
balanced, transformerless design configured for optimum low noise performance. The
input impedance is greater than 2K and is suitable for microphones in the 200 to 600
ohm range. Inputs are via Gold plated 3 pin XLR type connectors with latch which are
located on the rear panel. To operate the channel in the unbalanced mode, it is
suggested that the pin 3 terminal be connected to the ground terminal (Pin 1) inside the
XLR cable plug.
