Azur 551R

7.1 HDMI AV Receiver

As TVs become impossibly thin - and sound quality gets even leaner - there's never been a better time for a home theatre system that sounds sensational but is also simple to use.

Available Colours

Azur 551R

7.1 HDMI AV Receiver

As TVs become impossibly thin - and sound quality gets even leaner - there's never been a better time for a home theatre system that sounds sensational but is also simple to use.

Available Colours

Audiophile specification

Seven discrete amplifiers driven by a low-flux toroidal transformer are separated from the processing and input stages guaranteeing performance without compromise. And because typical set-ups now include a multitude of sources with digital audio connections, special attention has been given to the 551R's digital to analogue conversion process thus giving it the ability to maximise the audio potential of every connected digital device such as Blu-ray players, satellite boxes, iPod docks, games consoles and more.

Processing tour de force

And whilst musical performance is at the heart of the 551R, it also offers all the latest processing technologies to excite the most avid home cinema enthusiast including the most current Cirrus Logic DSPs and support for the latest CODECs such as Dolby TrueHD and DTS HD Master Audio. Meanwhile, a Faroudja 1080p video scaler vastly improves performance from lower resolution TV broadcasts and DVDs as well as transcoding analogue video inputs to the digital domain for simpler and neater connection to the TV using just one HDMI cable.


In terms of connectivity, the 551R boasts four HMDI inputs and a single HDMI output which fully supports 3DTV/Deep colour pass-through and Audio Return from newer digital TVs. It also features a wide selection of analogue video connections (ready for transcoding), four digital audio connections and a total of six analogue audio inputs.

Furthermore, the 551R includes a host of processing and adjustment features to get the most from every multi-channel movie soundtrack. These include full individual crossover adjustment and bass management, lip sync adjustment, Dolby Dynamic range control and DTS-HD speaker re-map (these features are explained in greater detail below).

Ease of set-up

AVRs typically have a habit of causing much head scratching but the 551R has been designed to ensure simple set-up and ease of use for all the family. Cambridge Audio's Microphone Controlled Auto Set-up (CAMCAS) tailors the 551R's performance to any room and comes complete with a microphone to complete this simple procedure. Day to day operation is equally straightforward from either the clear front panel controls or the supplied remote.

Clever cooling = compact design

But perhaps the most surprising feature of the 551R is its diminutive size - made possible thanks to a unique cooling design system called X-Tractâ„¢. A perfectly balanced combination of forced cooling and natural convection effectively draws heat away from the substantial transformer and output stages and means the 551R can operate extremely quietly, at a low temperature and enables a more compact enclosure than would normally be possible for such a powerhouse.

Our View
Acoustics Director
"My team and I took a relentless "sound first" approach to the design of our 551R so that as well as sounding great with movies it sounds incredibly musical too - something not easily achieved!"



  • 4 HDMI in, 1 out with support for 3D TV / Deep colour pass thru / Audio Return Channel reception
  • Faroudja FLI2310 video scaler for upscaling and analog to digital video transcoding/scaling (composite, S-video and component video to HDMI)
  • Scaler bypass mode - allows user to engage/disengage video scaler for each input as appropriate
  • Oversize low flux toroidal transformer and discrete amplifiers delivering ultra-low noise and distortion
  • Cirrus Logic dual 32-bit DSPs for compatibility with the latest CODECs including Dolby Digital Plus, DTS- HD High Resolution and the Lossless Dolby True HD and DTS-HD Master Audio formats
  • Pure Analogue Stereo Direct mode for audiophile playback of analogue stereo sources
  • Individual Crossovers and Advanced Bass Management
  • Cambridge Audio Mic Controlled Auto Set-up (CAMCAS) with microphone supplied
  • Full 5.1/7.1 multi-channel analogue inputs and preamp outputs
  • Adjustable lipsync delay per source
  • DTS Speaker re-mapping allows the playback of DTS-HD High Resolution or Master Audio formats with encoded height information on standard 5.1, 6.1 or 7.1 speaker setups
  • Bi-amp mode for front left/right with surround back left/right in 5.1 set-up
  • X-Tractâ„¢ Forced/Convection Heat Tunnel for virtually silent performance
  • FM/AM tuner with RDS
  • RS232 control, IR Emitter Input
  • Low resonance, acoustically damped full metal chassis
  • Navigator style Azur remote control
  • Also controllable from 651BD/751BD remote
  • Slim, aesthetic design - only 110mm (4.3'') tall!

Top Tips


Power output110W RMS per channel, into 6 Ohms (two channels driven). 90W RMS per channel, into 8 Ohms (two channels driven). 60W RMS per channel, into 8 Ohms (all 7 channels driven)
THD<0.006% @1kHz
Crosstalk<-60dB @ 1kHz
Frequency Response10Hz - 20kHz -1dB
Signal to Noise Ratio>90dB 'A' weighted
Audio input impedance/sensitivity47k Ohms / 175mV or greater
Digital input impedance75 Ohms (Coaxial/S/P DIF)
Tone ControlsBass: +/-10dB @ 100Hz Treble: +/-10dB @ 10kHz
TunerFM mode: 87.5-108MHz, 75 Ohm coaxial aerial AM mode: 522-1629kHz, 300 Ohm loop aerial
Video levels/impedance- Composite (CVBS): 1Vp-p / 75 ohm - S-Video (S-VHS): Y 1Vp-p / 75 ohm C 0.286 Vp-p / 75 ohm Component: Y 1Vp-p / 75 ohm Cb/Cr 0.75Vp-p / 75 ohm Pb/Pr 0.75Vp-p / 75 ohm
HDMIHDMI 1.4 EIA/CEA - 861D HDCP 1.1 All audio modes supported except reception of native Direct Stream Digital (DSD). ARC and 3D-TV/deep colour pass through supported. CEC and HEC not supported.
ArchitectureCirrus Logic CS43122 24 Bit 192kHz capable DAC for Front Left & Right Cirrus Logic CS52526 24 Bit 192kHz capable CODEC for surround channels + 24 Bit 2 channel A/D conversio Cirrus Logic CS497004 dual 32 bit DSP Faroudja FLI2310 scaler
Audio Inputs6 x Line Level Analogue Tuner (FM/AM) 7.1 Analogue Input 4 x Digital Co-axial, 4 Digital Optical
Video Inputs2 x Composite, 2 S-Video, 2 x Component Video, 4 HDMI
Audio Outputs7 x Amplified Speaker Outputs 7.1 x Preamp outputs
Video output1 x HDMI
Recording Audio outputs1 x Line Level Analogue 1 x Digital Co-Axial, 1 Digital Optical
Other Connections1 x 1/4" / 6.35mm Headphone Outpu (32 To 600 ohms recommended) 1 x IR Emitter In 1 x RS232C 1 IEC type mains inlet
Standby power consumption<1W
Quiescent power consumption<70W
Max. Power Consumption700W
Dimensions (W x H x D)430 x 110 x 340mm (16.9 x 4.3 x 13.3'')
Weight10.0Kg (22lbs)

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