CX335 User Manual v1.0
8
Installation
Mechanical
The CX335 is suitable for mounting in a standard 19”
equipment rack. It occupies one unit of rack space (1U). The
unit is 155 mm deep, but the rack should have at least
225 mm of depth available to permit clearance of the rear
panel connectors. Wherever possible, avoid positioning
the units in close proximity to strong magnetic fields or
equipment which may operate at a high temperature (e.g.,
high power amplifiers).
The CX335 is convection-cooled and generates no
significant heat. Apart from observing the guideline above (re
hot-running equipment), no special provision for ventilation
need be made. However, note that it is good practice not
to enclose any rack containing electronic equipment in a
completely sealed space, such as a cupboard.
Connections and adjustments
Power supply
The CX335 should be connected to AC mains power with
the IEC cable supplied. The IEC receptacle is located on
the rear panel. The unit is suitable for operation with mains
voltages in the ranges 220 to 240 V, or 110 to 120 V (see
section on “230/115 V voltage selection” below).
CAUTION - Mains Fuses
The CX335 is fitted with a replaceable mains fuse. This is
located on the rear panel adjacent to the AC mains input
connector. Only replace the fuse with one of an identical
type and rating.
AC
VOLTAGE
FUSE TYPE
FUSE
RATING
230 V
20 mm x 5 mm, T100mA
100 mA
115 V
20 mm x 5 mm, T200mA
200 mA
Note that the failure of the mains fuse may indicate an
internal fault. If a replacement fuse fails immediately the
power is restored, no further attempt should be made to
use the CX335, and it should be returned to your Cloud
service centre or other qualified person for repair.
230/115 V voltage selection
The mains transformer in the CX335 is factory-set for
operation from either 230 V or 115 V AC mains. The factory
setting is printed on the rear panel below the IEC connector.
If it is necessary to change the mains voltage setting, please
refer to the Appendix of this User Guide – Changing the AC
Voltage setting, on page 14
Signal path considerations
It is very difficult to give specific instructions regarding the
CX335’s location in the audio signal path, as this will depend
entirely on the other components of the installed audio
system.
Ideally, the CX335 should be connected immediately before
the power amplifier(s). Ensure that the outputs do feed all
the amplifiers in use. If the system uses active loudspeakers,
the CX335’s outputs should become the main signal
feed to the loudspeakers. Again, ensure that the CX335’s
outputs do feed all the loudspeakers in the system. If the
installation includes an electronic crossover or loudspeaker
management system, the CX335 should feed its inputs.
However, any graphic equaliser or similar item should
precede
the CX335 in the signal chain.
The inputs of the CX335 should be fed from the system’s
“source selection” component – which is likely to be a
mixer, a zoner or a preamplifier of some type in most
situations. Note, however, the comment regarding external
equalisers above.
The guiding rule is that the audio signal should always go via
the CX335 under all possible operational configurations.
For examples of possible system interconnections see
“Example System Signal Path” on page 6.
Inputs
Each of the CX335’s two channels has an electronically-
balanced input on a standard XLR3F connector. Twin-core
screened cable should be used when driving the inputs from
a device with a balanced output. Single-core screened cable
can be used when connecting to an unbalanced source. Wire
the inputs to the source devices using the convention shown
below:
Outputs
Each of the CX335’s two channels has an electronically-
balanced output on a standard XLR3M connector. Twin-core
screened cable should be used when driving amplifiers (or
other equipment) with balanced inputs. Single-core screened
