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651Aazur
Rear panel connections
Power On/Off
Switches the unit on and off. This switch is a master on/off control that
completely powers down the unit.
AC power socket
Once you have completed all connections to the amplifier, plug the
AC power cable into an appropriate mains socket and turn the unit on.
Your amplifier is now ready for use.
Loudspeaker terminals
Two sets of loudspeaker terminals are available, A (main loudspeaker
terminals, top row) and B (secondary switchable loudspeaker terminals,
bottom row). Connect the wires from your left channel loudspeaker to the
LEFT positive and negative terminals, and the wires from the right
channel loudspeaker to the RIGHT positive and negative terminals.
In each case, the red terminal is the positive output and the black
terminal is the negative output.
Care should be taken to ensure no stray strands of wire are shorting
speaker outputs together. Please ensure that the loudspeaker terminals
have been tightened adequately to provide a good electrical connection.
It is possible for the sound quality to be affected if the screw terminals are
loose.
The use of A and B speakers affords you an easy and inexpensive way to
create a simple multi-room system.
Note: When using two pairs of speakers, use speakers with a minimum
nominal impedance of 8 ohms.
IR (Infrared) Emitter In
Allows modulated IR commands from multi-room systems or IR repeater
systems to be received by the amplifier. Commands received here are not
looped out of the Control Bus. Refer to the ‘Custom Installation’ section
for more information.
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.
Sub-Out
This output can be used to connect to a subwoofer, if desired.
Pre-Out
These outputs can be used to connect to the inputs on an external power
amplifier or an active subwoofer, etc.
Record Out 1/2
These two identical output sockets can be connected to a tape deck or
to the analogue Record In sockets on a MiniDisc or CD recorder etc.
S1-S5
These inputs are suitable for any 'line level' source equipment such as
BD/DVD players, DAB or FM/AM tuners, CD players, Netwok Players, iPod
docks, MP3 players, etc.
Note: These inputs are for analogue audio signals only. They should not
be connected to the digital output of a CD player or any other digital
device.
Connecting a turntable
If it is desired to connect a turntable without a built-in phono stage, an
external phono stage such as our 551P or 651P models should be used.
Contact your Cambridge Audio dealer for more details.
Note: A very few turntables have built-in phono stages, in which case it is
not necessary to use a separate phono stage amplifier. If you’re unsure,
please consult your turntable user manual.
USB interface
A USB B type socket is fitted to the 651A 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 certified cable for USB Audio preferably one that
displays an official mark. USB cable connections longer than 3m may
result in inconsistent audio performance.
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Always turn the Volume to minimum, or turn the
651A off before plugging/unplugging cables to the
USB input or whilst booting up your PC/Mac.