Owner's Manual

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851C
Rear panel connections
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Power
On/Off
Switches the 851C on and off.
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Mains
Voltage Selector
Switch
(CU
version
only)
Switches the 851C mains
voltage
between
100V
and
115V
.
Note:
For
use
by
Cambridge Audio service
personnel only!
®
Power Socket
Once all
other connections are made, connect the
supplied
power cable
to the 851C power
socket and to
an
appropriate mains socket. The 851C
is
now ready for use.
0
RS232C
Interface
The RS232C interface
enables external serial control
of the 851C
in
custom
installation
applications. A command set is
available on the
Cambridge Audio website
at
www.cambridge-audio.com. The RS232
interface can
also
be used
by
Cambridge Audio service
personnel
for
software updates.
®
IR
(Infra
Red) Emitter
In
A
3.5mm
mini-jack socket
that
enables modulated
IR
commands from
multi-room
or
IR
repeater systems to be received
by
the 851C.
Note: Commands received
by
the
IR
Emitter
In
socket are not
looped
out
of the
Control
Bus. Refer to the 'Custom
Installation'
section for more
information.
@
Control Bus
In -
An
RCA
phono socket
that
enables
un-modulated commands from
multi-rooms
systems or other components to be received
by
the 851C.
Out
-An
RCA
phono socket
that
provides
control
bus
output
commands
for further downstream units.
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Digital
Outputs
The 851C
digital
outputs
enable a separate
DAC
(digital
to
analogue
converter) or
digital
recording device to
be
connected. Refer
to
the
'Operating instructions' section for more information.
Three concurrent
digital
outputs are
available.
Note these outputs pass
through the
currently selected
audio source un-processed, i.e. no
volume
control
or up-sampling is performed on the
digital
outputs.
Balanced
AES/EBU
-
For
external
devices incorporating a
balanced
(AES/EBU)
digital
input.
Note: The acronym "AES/EBU" refers to the Audio Engineering Society
and the European Broadcast Union.
Coaxial
-
To
obtain best
results,
use a high
quality
75
ohm
digital
RCA
interconnect
cable
(not one designed for normal
audio use).
Toslink
Optical -
Use
a high quality
TOSLINK
fibre optic interconnect
cable
designed
specifically
for audio use.
®
USB
Interface
A
USB
B type socket is fitted to
the
851C to
enable
the playback
of
audio
from a personal computer running either Microsoft Windows or
Apple
Mac
OS
X operating systems. Some builds of Linux are
also suitable.
Note:
Always
use a high quality
USB
connection
cable certified as
USB
Hi-
Speed.
USB
cable
connections
longer
than 3m may
result
in
inconsistent
audio performance.
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Always turn the
Volume to
minimum,
switch to another
input
or
turn the
851C
off
before
plugging/unplugging
cables
to
the
USB
input
or whilst booting
up/shutting
down your
PC
/ Mac.
®
Ground Lift Switch
The Ground Lift Switch enables the
USB
interface earth to be
disconnected from the 851C chassis earth. Disconnecting (lifting) the
earth can be
useful
if
electronic hum is heard through the speakers
when the
USB
input is selected. The switch
should
otherwise
be
left
in
the Ground position.
@-@
Digital Inputs
1
&
2
The 851C has three
digital
inputs in total. Inputs 1 and 2 feature both
S/PDIF co-axial
and
Toslink optical
sockets.
For each input
you
can use whichever is most convenient, but not both
at
the same time.
Coaxial
-
Use
a high
quality
75
ohm
digital
RCA
Phono interconnect
cable
(not one designed for
normal audio use). This input is suitable
for
16-24
bit content up to
192kHz
.
Toslink Optical
- Use a high quality
TOSLINK
fibre optic interconnect
cable
designed
specifically
for audio use. This input is
suitable
for 16-24
bit
content up to 96kHz
(Toslink
is not recommened
at
192kHz
sampling
rates).
@)
AES/EBU
Digital Input
For
sources with a
balanced
(AES
/
EBU)
digital
output. This input is
suitable
for 16-24 bit content up to 192kHz.
@
Unbalanced Audio Output
A conventional
RCA
phono stereo
output
for connection to the
line-level
inputs
of
an amplifier.
Use
a high
quality
stereo
RCA
phono interconnect
cable
intended for
analogue
audio
signals.
@
Balanced
Audio Output
The 851C features balanced outputs on two
XLR
sockets.
Balanced
outputs provide slightly
better audio performance and can reject
cable-
borne
noise and interference when used with equipment with
balanced
inputs.
Note:
XLR
connectors
should
be wired as
follows:
Pin
1: Ground
Pin
2: Hot (in-phase)
Pin
3:
Cold
(phase-inverted)
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