CX261 Installation and User Guide v1.5
12
Main Output
Connect the inputs of the power amplifiers feeding the
loudspeakers for each zone to the
LEFT
and
RIGHT
OUTPUT
connectors. Note that the main output is stereo
by default; it may be reconfigured to operate in mono by
moving internal PCB jumper J4 (see page 20
). The outputs
are balanced and will drive input impedances down to
600 ohms. Nominal output level is 0 dBu (775 mV). The
output is designed to drive professional/industrial power
amplifiers with balanced inputs (typically on XLRs). In this
case, wire as the diagram below. Note that the screen can
be left unconnected at the source end if earth loops are a
problem.
1
3
+
-
+
-
SC
N
pin 1 ground
pin 2 hot
pin 3 cold
Balanced inputs (XLRs):
1
2
3
2
SC
SCN
CX261 Balanced output:
pin 1 ground
pin 2 cold
pin 3 hot
The screen connection at the
zone end may be omitted if it
helps reduce earth loops
Amplifiers with unbalanced inputs:
If audio amplifiers with unbalanced inputs are being used (e.g.,
hi-fi amplifiers), the following wiring should be adopted:
1
3
+
+
2
SC
SCN
CX261 Balanced output:
pin 1 ground
pin 2 cold
pin 3 hot
When using single-core cable,
don’t connect ‘cold’ at the
CX261
Unbalanced input (e.g. phono)
1
3
+
+
-
2
SC
SCN
CX261 Balanced output:
pin 1 ground
pin 2 cold
pin 3 hot
Unbalanced input (e.g., phono)
When using twin-and-screen
cable, don’t connect the screen
at the amplifier end.
-
MOH/Auxiliary Output
The MOH (Music On Hold), or auxiliary output, provides a
transformer-isolated L+R mono sum of the music channel.
This is intended to provide a continuous music feed for use
with a telephone system. If it is not required for this, it may be
used as a auxiliary mono output for another suitable purpose.
However, it should be noted that a fixed LF filter reduces
bass frequencies from this output to optimise it for use with
telephone systems. The microphone inputs are not mixed into
this output, so that internal paging announcements are not
heard by telephone callers. This fact should be borne in mind
if the output is used for some other purpose.
The output is a 3-pin 3.5 mm-pitch screw terminal connector
on the rear panel ([12] at page 9
). The output level is
-6 dBu (nominal) and is suitable for driving 600 ohm loads.
The output is transformer-coupled to provide full galvanic
isolation from a telephone system. Because of this, pin 2
(cold/-) must always be connected. If wiring to an unbalanced
input, the convention shown below should be followed:
1 2 3
CX261 MOH/Aux output:
pin 1 ground
pin 2 cold
pin 3 hot
+
+
SCN
SCN
Unbalanced input (e.g., phono)
Music Control
Like many other Cloud products, the CX261 allows remote
control of music level and source selection. Cloud remote
control plates from the RL-1 Series (music level only) and
RSL-6 Series (music level and source selection) provide an
elegant solution, though control via a DC voltage from third-
party systems is also possible (see “Control of music source
and level via external DC” on page 18
).
Both types of remote control plate connect via the RSL-6
port (see [15] on “Description of rear panel” on page 9
).
This connector is a 3-pin 5 mm-pitch screw terminal type.
Using single-core cable.
Using twin-core cable.
