CXM Technical
MANUAL
13
required, with a 6dB loss in gain (see 6.02 Unbalanced Mode). The CXM M2 is designed
to interface with equipment requiring OdBu (775mV) signal level and has both gain and
headroom margins to successfully match a wide range of ancillary equipment.
4.08
Output 2
The output 2 section is primarily intended to provide an extra output zone, as such it is
very similar to the main output. Level control of the mic and music signals is achieved by
means of two independent rotary controls. The main output faders have no control over
the levels on output 2. As with the main output, separate left and right balanced outputs
are provided, using 3 pin XLR type connectors which can be used in the unbalanced
mode if required, with a 6dB loss in gain (see 6.02 Unbalanced mode). Output 2 can be
configured to provide a mono output by means of a latching push switch which is
accessible through a 3mm diameter hole in the rear panel, adjacent to the Output 2
XLRs.
4.09
AVO (Auto Voice Over)
Comprehensive auto voice over is provided and features separate controls for
Attenuation, Release and Sensitivity. The On/Off switch has LED indication and a further
LED illuminates when the operation threshold has been reached. The auto voice over
detects any microphone signal to effect gain reduction on music signals.
4.10
Master Auxiliary Sends
These Master controls adjust the overall output signal derived from the channel modules.
With the control in the maximum position a maximum output of 0dBu (775mV) is
available. The balanced stereo output is by way of 1/4" 3 pole jack sockets with a facility
for a mono signal by using the left output socket only. For unbalanced operation a 2 pole
jack plug should be used.
4.11
Auxiliary Return
This stereo input facility is primarily intended to be used for Auxiliary return purposes. The
2 x 1/4" 3 pole jack sockets are used for the balanced inputs and have a sensitivity of -
7dBu (350mV) at 20k
Ω
. The signals are routed to the master music summing amplifier
and are subject to attenuation through the AVO circuit. If more comprehensive control of
the return signal is required, the use of a channel module is customary. There is also no
reason why the Aux return cannot be used as an extra basic input if required. Unbalanced
signals can be connected by simply using a 2 pole jack plug.
4.12
PFL / Headphone Amplifier
All PFL selections are routed to the stereo headphone amplifier and PFL VU display. The
stereo headphone amplifier is extremely powerful, it can deliver over 1 watt per channel
into the optimum load of 32 ohms. If high listening levels are a pre-requisite, we
recommend the use of headphones with an impedance in the range 8 to 60 ohms.
Performance into 600
Ω
'phones is more than adequate and a 3 pole 3" jack socket is
provided on both the front and rear panels.
The installer must be aware of health and safety requirements of IEC TC84 regarding
sound pressure level when using headphones.
The use of a 2 pole jack plug should be avoided. The input signal follows the selected
PFL channel.
4.13
Split Cue
It is sometimes required, usually when mixing in sync', to monitor a pre-fade signal with
that of the output signal. This is accomplished in the 'split' mode by routing the 2 signals
to each half of the stereo headphone amp and PFL display. In this mode, a mono mix of
the PFL signal is routed to the left channel with a mono mix of the Main output signal
routed to the right channel. A rotary balance control is provided to compensate for
different signal levels: this control is operational in the split cue mode only.
