Cloud Electronics 46-120TMedia - Manual (Page 14)

46-120 Installation and User Guide V1.2 14
INSTALLATION
Hardware considerations
The 46-120 Mixer Amplifier is built in a 2U-high 19” rack
mount enclosure. It is recommended that the 46-120 is
installed in a 19” rack wherever possible. The units are approx.
410 mm deep, but at least 500 mm of rack depth should be
available to allow for rear connectors and cabling.
The 46-120 uses thermostatically-controlled, variable speed
forced-air cooling. Depending on the ambient temperature
and signal levels, the fan (on the rear panel) may or may not
rotate; this is normal operation. The enclosure has air intake
slots in the front panel; ensure that these are not obstructed
once the unit is installed. Warmed air is expelled at the rear
of the unit by the fan. It is recommended that 1U blank panels
are fitted in the rack above and below the 46-120; do not fit
slotted ventilation panels as these defeat the action of forced-
air cooling.
If the unit is to be used free-standing (i.e., not mounted in a
rack), the four feet supplied in the accessory pack should be
fitted to the bottom of the chassis. These should be inserted
into the four 5 mm dia. holes clearly identifiable in the corners
of the bottom panel, and secured by then inserting the plastic
rivets through the centre holes in the feet.
The choice of location will be dictated by the specifics of the
system and building layout. It is recommended that wherever
possible, the 46-120 should be mounted adjacent to as many
of the music sources (CD players, music servers, TV receiver
boxes, etc.) as practical.
When deciding the Mixer Amplifier’s location, bear in mind
that access to it (particularly the rear panel) will probably
be required from time to time even if a full complement
of remote controls is being fitted as part of the system, as
certain adjustments can only be made on the unit itself.
Power Supply
The European version of the 46-120 operates on standard
230 V AC mains; an alternative version is available which
operates on 115 V AC. An IEC mains cable with a plug
appropriate for each country is supplied with the European
unit. The unit’s power consumption is 370 VA.
Fuses and ratings
The only externally-accessible fuse is an AC mains fuse on the
rear panel.
Only replace a fuse with one of exactly the
same type. The table below gives the correct fuse types.
VERSION RATING FUSE TYPE
230 V 4 A 20 mm x 5 mm HBS T4A
115 V 8 A 20 mm x 5 mm HBS T8A
The fuseholder is of the “bayonet” type; press and twist the
holder anticlockwise to remove the fuse. If a replacement
fuse blows immediately, it indicates that the mixer amplifier
has developed a fault, which should be referred to competent
service personnel.
Internally, two 20 mm x 5 mm fast-blow F8.0A fuses protect
each amplifier channel (eight in total). These are service
components, and should not require attention. Failure of any
of these fuses indicates a fault condition, which should be
immediately referred to a competent technician or authorised
service centre.
System connections
Music sources
Connect the system’s various music sources to LINE 1
to LINE 6 as required. All line inputs offer unbalanced
connection for stereo sources on a pair of standard RCA
jacks (phono sockets). The sensitivity range available should
allow most standard items of audio equipment such as
computers/tablets, music servers and media receivers, etc., to
operate at a satisfactory level. Most equipment of this type
will have stereo unbalanced outputs, and as long as the source
equipment is adjacent to the Mixing Amplifier, normal phono-
phono (or 3.5 mm jack-to-phono) leads can be used. Always
avoid using pre-made leads of an unnecessary length.
On 46-120
MEDIA and 46-120T MEDIA models, the media
player uses Music Input 1 (LINE 1); set the rear panel
LINE 1/MEDIA button OUT for the media player to be
available to the zones as Music Source 1. Press the button IN
if the media player is not in use; this permits LINE 1 inputs to
be used in the normal way.
Mono and stereo sources:
The mixing section of the 46-120 is mono; the stereo line
inputs are summed internally. Stereo sources should be
connected in a normal stereo configuration, using both L
and R inputs. If connecting a mono source with only a single
output, it may be connected to either the left or the right
input.
Balanced sources:
If it is necessary to connect an item of source equipment
with a balanced output to the 46-120, a balancing transformer
should ideally be inserted between the source and the
unbalanced input. Suitable audio transformers, which should
have a ratio of 1:1, are readily available from major audio
component suppliers. The transformer(s) should be mounted
as close to the 46-120 as practical, and housed in a screened
enclosure if they are not individually screened. The preferred
connection method is shown on the following page.