The process of setting up the 651R/751R is first to make all the connections
to your speakers and source equipment and then set the unit up via its On-
Screen Display (OSD). There are various settings and adjustments that need
to be made before the 651R/751R can be used.
However before you actually decide which connections to make or perform
any adjustments it is strongly advised that you read through the
‘651R/751R setup’ section of this manual first, starting on page 16.
A lot of explanation is included that will help you to choose the right
connection types for both your sources and TV.
Thank you for purchasing your 651R or 751R AV Receiver. We are confident
that you will enjoy many years of listening pleasure from it. Like all
Cambridge Audio products the 651R/751R adheres to our three core
principles – stunning performance, ease of use and incredible value.
As such, the seven audiophile grade fully discrete class AB amplifiers are
kept as separate as possible from the processing and input stages and
feature a large power supply with a low flux toroidal transformer. This careful
design of the amplifier stages ensures that the 651R/751R can reproduce
the dynamics and scale required for modern movie soundtracks whilst also
being able to reproduce a genuinely musical performance with either stereo
or multichannel music sources.
A full range of HDMI, digital and analogue inputs are fitted. These allow the
connection of suitably equipped Blu-ray players, DVD players, satellite/set-
top boxes and games consoles for decoding into stereo, stereo + sub or
various digital surround formats.
The latest formats are supported including Dolby True HD, Dolby Digital Plus,
DTS-HD Master Audio and DTS-HD High Resolution Audio in 5.1 or 7.1
variants. In particular, support for the true lossless Dolby True HD and DTS-
HD Master Audio formats provides unprecedented audio fidelity from Blu-ray
Various HDMI 1.4 features are supported including 3D TV and deep-colour
pass-through from suitable sources and Audio Return from TVs with this
The 651R/751R is also capable of decoding encoded analogue or digital
stereo sources in Dolby Pro Logic® II or IIx and DTS Neo:6, for a convincing
and effective surround experience from a matrix encoded stereo source.
Sophisticated post-processing of 5.1 digital material is also possible with
Dolby Pro Logic IIx or DTS Neo:6 to turn these formats into 7.1.
Alternatively Dolby Pro Logic IIz processing allows height channel generation
from Stereo or 5.1/7.1 material for an alternative 5.1 + Height presentation.
Conventional analogue stereo inputs allow the connection of audiophile CD
players and the like, and an Analogue Stereo Direct mode with no processing
ensures the very best possible stereo reproduction for these.
The 651R/751R also carries a 5.1/7.1 channel analogue input. This feature
allows for the connection of a DVD-Audio or SACD player equipped with a 5.1
output and is compatible with any future external 7.1 audio formats.
As well as the full complement of audio inputs, the 651R/751R performs
Composite, S-Video, Component Video and HDMI switching with transcoding
and scaling (up-converting) of all analogue video to HDMI.
A Zone 2 output allows the Surround Back Amplifiers to be used to power
another Zone if these are not being used for 7.1 output in the Main Zone.
Alternatively if you wish to use all 7.1 channels in the Main Zone a separate
power amplifier and speakers can be connected to the Zone 2 preamp
Both Main and Zone 2 remotes are supplied with the 651R/751R.
, Audyssey Dynamic EQ
, Audyssey Dynamic Volume
Autosetup help achieve the best performance in your particular room and
with your speaker setup.
An RS232 port and IR Emitter In also make it easy to integrate the
651R/751R into a Custom Install situation.
The 651R and 751R share all the extensive features above. The 751R differs
from the 651R by being more powerful, having one extra HDMI 1.4 input on
the rear and an additional HDMI 1.3 In on the front panel. The 751R also
features Anagram Technologies ATF up-sampling on all channels.
This is performed by a third DSP (Digital Signal Processor) over the two used
in the 651R which converts all digital audio to 24-bit/192kHz with
comprehensive jitter suppression before conversion by the DACs.
Finally the 751R also features a 24 Bit Asynchronous USB Audio input
capable of up to 24-bit/192kHz Audio from Mac and PC.
All this proprietary engineering is housed within our low resonance,
acoustically damped chassis. An Azur Navigator remote control is also
provided, giving full remote control of your AV receiver in an attractive and
easy to use handset.
Remember your 651R/751R can only be as good as the system it is
connected to. Please do not compromise on your source equipment, speaker
package or video and audio cabling. Naturally we particularly recommend
Blu-ray players, digital and analogue iPod docks, Network and CD players
from the Cambridge Audio Azur range, which have been designed to the
same exacting standards as our receivers. Your dealer can also supply
excellent quality Cambridge Audio interconnects to ensure your system
realises its full potential.
Thanks for taking the time to read this manual, we do recommend you keep
it for future reference.
Cambridge Audio Technical Director
and the 651R/751R design team