CX242:
I
NSTALLATION AND OPERATION MANUAL
7
6.01 Equalisation
Both Zone 1 and Zone 2 have separate treble and bass controls for the music signals and
the microphone signals. These pre-set controls are protected by the front panel mounted
anti-tamper panel. The music treble control has a range of ±10dB at 10kHz and the music
bass control operates with a range of ±10dB at 50Hz. The microphone tone controls
operate at ±10dB at the frequencies of 8kHz and 100Hz.
6.02 Switch-on
Mute
When the CX242 is switched on, a two stage mute circuit operates. The music signals are
fully muted for a period of two seconds, followed by a five second period when the music
level smoothly changes to the level set by the controls. During this switch-on mute cycle,
the red 'Music Mute' LED will illuminate.
6.03 Remote Control Requirements
The CX242 is fitted with VCA control of the music level as standard but if remote control
of the signal source and level is required, then the optional 'Remote Source/Level Plate'
(RSL-1) is required. Both Zone 1 and Zone 2 can be operated remotely or by local control
as required.
The RSL-1 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 must be used to link the remote plate to the CX242. Connect the cable screen to
terminal 1 on both the mixer connector and the remote plate. Terminals 2 & 3 on the
mixer connector should connect to terminals 2 & 3 respectively on the remote plate.
When the mono mode is selected and the front panel source select switch is used, a
remote plate with a level control only is available (RLC- 1) for installations where separate
control of the mono signal present on the right output socket is required. Single screened
cable can be used for the RL-1, connect the screen to terminal 1 and the core to terminal
2, with no connection to terminal 3.
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Remote Music Mute - Fire Alarm Interface
In certain circumstances, there may be a Local Authority or Fire Service requirement to
mute the music signals via a fire alarm control panel in an alarm condition. The CX242
provides a facility to attenuate the music signals only, by using a fully isolated pair of
contacts (usually a relay mounted close to the CX242 which is powered by the fire alarm
control panel) which should close during an alarm condition.
In the mute mode, a music gain reduction of between 20dB and 70dB (full mute) is
effective and the desired mute level can be set by adjusting the small pre-set level control
adjacent to the 2 pole remote music mute connector on the rear panel. The front panel
mounted 'Music Mute' LED will illuminate to indicate the operation of the mute circuit.
15/07/02 V4
