CX-A4
I
NSTALLATION AND OPERATION MANUAL
6
10 VCA
Modules
A two-channel VCA module is available as a plug-in option for the CX-A4 (see section 13
for installation details) and is supplied with either one or two control plates. The unit can
operate two channels independently or switched to provide stereo attenuation via one
control plate. For independent operation, the switch should be in the 'solo' position (in),
with the remote level controls connected to both 3 pin connectors. For stereo operation,
position the switch in the link position (out) and connect the level control to the left
connector only. The RL-1 remote control plate is compatible with domestic electrical
accessories and can be mounted onto a standard British flush or surface mounted 25mm
deep back box. Two-core cable with overall screen should be used to connect the remote
level control to the module mounted inside the CX-A4. The circuitry uses the industry
standard 'Thats 2150A' VCA providing very low distortion and up to 90dB attenuation.
The VCA module can be wired to provide muting by using an auxiliary relay connected to
a fire alarm control panel.
Note:
A VCA module cannot be installed to channels that already have a Bose
equalisation module installed.
11 Peak Limit + VCA Modules
A two channel peak limit + VCA module is available (see section 13 for installation
details) which performs the same functions as the module described above with the
added benefit of a peak limiter which is factory set to prevent clipping. A 'Peak Limit'
on/off switch is mounted on the rear panel that can be over-ridden by configuring a PCB
mounted circuit jumper. The limiter operates with hard knee characteristics and has an
infinite compression ratio.
Note:
A Peak Limit + VCA module cannot be installed to channels that already have a
Bose
equalisation module installed.
12 Remote Level Plate Connections
REAR VIEW OF CX-A4 AMPLIFIER
1 2
3
USE 2 CORE SCREENED CABLE
CONNECT SCREEN TO TERMINAL 1
REAR VIEW OF LEVEL CONTROL PLATE
LINK
REMOTE LEVEL
CLIP
PROTECT
OFF
ON
SOLO
1
2
1+2
1
2
SOURCE
1
2
3
1
2
3
1
2
15-07-02 V9
