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Rear panel connections
1
Power On/Off
Switches the unit on and off.
This product has APD (Auto Power Down) enabled as default. After
inactivity of 30 minutes, the product will automatically switch to Standby.
See later section for further details.
2
AC power socket
Once you have completed all connections to the DAC, plug the AC power
cable into an appropriate mains socket then switch on. Your unit is now
ready for use.
3
Mains Voltage Selector Switch (CU version only)
Switches the 851D mains voltage between 100V and 115V.
Note: Intended for use by a professional installer or Cambridge Audio
retailer only.
4
RS232C
The RS232C port allows external serial control of the 851D for custom
install use. A full command set is available on the Cambridge Audio
website at www.cambridge-audio.com. This port can also be used by
Cambridge Audio service personnel for software updates.
5
IR (Infrared) Emitter In
Allows modulated IR commands from multi-room systems to be
received by the amplier. Commands received here are not looped out
of the Control Bus. Refer to the 'Custom installation' section for more
information.
6
Trigger Out
This 12V trigger output can be used to control external devices such as
an 851W or another power amplier, or a subwoofer, projector, screen
etc. See later section for further details.
7
Control Bus
In - Allows un-modulated commands from multi-rooms systems or other
components to be received by the unit.
Out - Loop out for control bus commands to another unit. Also allows the
851D to control some Cambridge Audio units.
8
BT100/Ext.
The optional Cambridge Audio BT100 Bluetooth Adaptor can be plugged
in here adding wireless streaming audio capability directly from most
phones, tablets and laptops. Will also be use for planned optional future
wireless modules. Can also be use for charging devices up to 500mA.
See later section for details.
9
Digital Outputs
The 851D digital outputs allow connection to a separate DAC (digital to
analogue converter) or can be used to loop the selected signal through
to an AVR.
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.
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 bre optic interconnect
cable designed specically for audio use.
10
USB Interface
A USB B type socket is tted to the 851D 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 certied as USB Hi-
Speed. USB cable connections longer than 3m may result in inconsistent
audio performance.
Always turn the Volume to minimum, switch to another
input or turn the 851D 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 851D 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.
11
Digital Inputs 1 – 6
The 851D has 6 digital inputs in total. Inputs 1 and 2 feature both S/
PDIF co-axial and Toslink optical sockets. You can use whichever is most
convenient, but not both at the same time. Inputs 3 and 4 feature Toslink
optical sockets only. Input 5 features BNC co-axial socket and input 6
features a AES/EBU Balanced socket.
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 bre optic interconnect
cable designed specically for audio use. This input is suitable for 16-24
bit content up to 96kHz (Toslink is not recommened at 192kHz sampling
rates).
BNC 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. If required, a BNC to RCA coaxial adaptor
or a BNC to RCA coaxial cable can be used to provide connectivity to a
third S/PDIF coaxial digital input source
AES/EBU For sources with a balanced (AES/EBU) digital output. This
input is suitable for 16-24 bit content up to 192kHz.
851Dazur
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