851W
azur
ENGLISH
5
Rear panel connections
1. Loudspeaker terminals
For normal wiring, connect the wires from your left channel loudspeaker
to the LEFT + & - terminals, and the wires from the right channel
loudspeaker to the RIGHT + & - terminals. In each case, the red terminal
is the positive output and the black terminal is the negative output.
Other dual mono schemes are also possible if two 851Ws are used.
Refer to later sections of this manual for more information.
Use speakers with a nominal impedance of between 4-8 ohms. Care
should be taken to ensure no stray strands of wire short the loudspeaker
outputs together. Please ensure that the loudspeaker terminals have
been tightened completely to provide a good electrical connection. It is
also possible for the sound quality to be affected if the screw terminals
are loose.
Audio input types
The 851W features either unbalanced (phono/RCA) or balanced (XLR)
input connections. Either type may be used but not both at the same
time. The balanced connection is the higher quality option and can reject
noise and interference in the cable when used with other equipment
that supports this function. An XLR connector is wired Pin 1 - Ground; Pin
2 - Hot (in-phase); Pin 3 - Cold (phase-inverted).
Use the Left and Right Input Type switch (Item 4) to select the connection
type you wish to use. When using either the balanced or unbalanced
input, make sure that no cables or equipment are connected to the
unused input, as this may degrade operation. The unused input does
not need to be terminated and this should not be done.
2. Balanced Audio
For connection to the balanced XLR outputs of suitable pre-amplifiers
that have this kind of output (such as our own 851E model). The pre-
amplifier used should be capable of providing at least 1V rms of output
per phase (i.e. at both of + and – terminals of the XLR, more is also fine).
Nearly all modern pre-amplifiers fulfill this requirement.
3. Unbalanced Audio
For connection to the normal (single ended) RCA/Phono outputs of a
suitable pre-amplifier (such as our own 851E model). The pre-amplifier
used should be capable of providing at least 1V rms of output (more is
fine). Nearly all modern pre-amplifiers fulfil this requirement.
4. Input Type switch
Use to select a balanced or unbalanced connection type for the input.
5. Stereo/Mono mode switch
Switches the 851W between ‘normal’ Stereo operation (where one
851W is used for a pair of speakers) and Mono operation (where two
851W’s are used one for each speaker). Refer to later sections of this
manual for more information.
6. Mono mode switch
When Mono mode has been selected, switches the 851W between Bi-
Amped Mono and Bridged Mono. Refer to later sections of this manual
for more information.
7. Control Bus
In
- Allows un-modulated commands from multi-room systems or other
components to be received by the unit.
Out
- Loop out for Control Bus commands to another unit.
The 851W can also be switched between On and Standby mode by
connecting the Control Bus output of an 851E pre-amplifier to the
Control Bus input of the 851W. Refer to the ‘Power syncing’ section of
this manual for more information.
8. Trigger In, Out/Thru
For Custom Install use or with preamps and with trigger outputs, the
851W can be turned on and off (i.e. brought in and out of Standby
mode) by the presence of 5-12V DC at the Trigger input. A trigger input
will also produce an internally generated 12V DC trigger output at the
Output/Thru connection. Turning the 851W on from the front panel also
produces a 12V DC trigger output at the Output/Thru connection. This
can be used to turn on/Standby other connected power amplifiers or
other equipment if desired. Refer to the ‘Power syncing’ section of this
manual for more information.
9. IR (Infra-Red) Emitter In
Allows modulated IR commands from multi-room systems or IR repeater
systems to be received by the unit. Commands received here are not
looped out of the Control Bus. Refer to the ‘Custom installation’ section
for more information.
10. AC power socket
Once you have completed all connections to the unit, plug the AC power
cable into an appropriate mains socket then switch on. Your unit is now
ready for use.
11. Power On/Off
Switches the unit on and off. If the 851W is not going to be used for long
periods of time it should be turned off using this switch.
12.
Mains Voltage Selector Switch (CU version only)
Switches the 851W mains voltage between 100V and 115V.
Note:
For use by Cambridge Audio service personnel only!
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