Cambridge Audio AZUR 851A (Black)

Stereo Amplifier

In stock
£1,399
Buy in-store & take it home today! Find store details Buy by phone Call our UK based team on 0333 900 0093


"Extraordinary array of features; refined and revealing sound that puts musicians in the room... Smooth, svelte sounding amp with power."Hi-Fi Choice magazine.

Class XD amplifier design

What makes this amplifier very special is the Class XD amplification. This combines the best qualities of Class A amplification - smoothness and realism - with the best from Class B - power and control, without the disadvantages inherent with many Class AB designs. What you'll hear is a smooth, yet detailed sound quality with the ability to drive almost any speaker and a substantial power output.

Massive toroidal power supply
At its heart, the 851A is powered by a massive toroidal power supply, which accounts for a third of its the weight. Not surprisingly the 851A has a monster power output: 2 x 120W into an 8 ohms and an awesome 2 x 200 watts into a 4 ohms. What this means in terms of sound quality is deep, effortless bass. Furthermore, such is the control and current that the 851A handles tricky dynamic sections, such as the sweep of a full orchestra with consummate ease.

Power with control
The 851A can do subtle, too. By using a separate toroidal power supply for the pre-amp section, the 851A ensures that pre-amplified signals arrive at the power amp stage in the best condition possible and so are brimming with subtle detail. Short of having a separate pre/power amp combo, this separate power supply is the next best thing.

Dual mono configuration
With separate taps for the left and right channel from the power supply, and separate left and right amplifier circuits, the 851A is a true dual mono amplifier. By having separate circuits for the left and right channels, each channel has its own, distortion-free feed. This brings about greater separation between instruments, greater width of sound and enhanced realism.

Plenty of connections
With no fewer than eight audio inputs, the 851A is capable enough to handle even the most complex of systems. XLR balanced connections offer a professional-grade connection with compatible equipment, such as the 851C CD player and Stream Magic 6 network player. Fixed level inputs make it easy to use the Azur 851A as the front amplification as part of a home cinema system, while the large display can be programmed to name your sources, so that, for example, the PlayStation 3 input is labeled, 'PS3' rather than 'Aux 3'.

Full metal casing
Using a full metal casing with rounded edges, doesn't just look and feel good, it helps the sound, too. The case is rigid and well damped, so it won't resonance unhelpfully. The thick aluminium front panel looks the part and also acts as a shield against electrical interference from sources such as dimmers and RF devices. All these details combine to create an amplifier that not only looks stylish but also offers exceptional resistance to both mechanical and electrical interference.

To experience music more vividly than ever before, the Cambridge Audio Azur 851A provides your front row seat.

We'll happily come to you!

Our experienced advisors are able to visit you at your home or place of work today, to help select the right equipment at the best prices.

6 Year Supercare £139.90

Add our Supercare to your basket when you check out. We'll cover your items for 6 years and give you your money back if unused.

Free UK delivery

Next day delivery and timed options available for online purchases of selected products. Please see checkout for further details.

Buy now, pay later For purchases over £500, pay a 10% deposit now and the balance in 6 months. Pay the balance in full before the end of the 6 months and there is no interest to pay whatsoever, just a one-off settlement fee of £29. Find out more

We offer 6 month interest free options. Call or ask in-store for details

Lowest price guaranteed! We're confident that our prices are amongst the very keenest out there, so we've made it as easy as pie to qualify for our Price Beat. Richer Sounds also guarantees to beat web prices, and Price Beat is even valid for 7 days after purchase, so if you've seen a cheaper price, let us know, and we'll happily beat that price by up to £100!

Products must be brand new, boxed, carry a comparable guarantee and be in stock at time of purchase. Richer Sounds price used to compare will be net of any voucher / trace in discounts.
T&Cs apply

We’ll beat any genuine advertised price, even from the web & give you up to £100!


"Extraordinary array of features; refined and revealing sound that puts musicians in the room... Smooth, svelte sounding amp with power."Hi-Fi Choice magazine.

Class XD amplifier design

What makes this amplifier very special is the Class XD amplification. This combines the best qualities of Class A amplification - smoothness and realism - with the best from Class B - power and control, without the disadvantages inherent with many Class AB designs. What you'll hear is a smooth, yet detailed sound quality with the ability to drive almost any speaker and a substantial power output.

Massive toroidal power supply
At its heart, the 851A is powered by a massive toroidal power supply, which accounts for a third of its the weight. Not surprisingly the 851A has a monster power output: 2 x 120W into an 8 ohms and an awesome 2 x 200 watts into a 4 ohms. What this means in terms of sound quality is deep, effortless bass. Furthermore, such is the control and current that the 851A handles tricky dynamic sections, such as the sweep of a full orchestra with consummate ease.

Power with control
The 851A can do subtle, too. By using a separate toroidal power supply for the pre-amp section, the 851A ensures that pre-amplified signals arrive at the power amp stage in the best condition possible and so are brimming with subtle detail. Short of having a separate pre/power amp combo, this separate power supply is the next best thing.

Dual mono configuration
With separate taps for the left and right channel from the power supply, and separate left and right amplifier circuits, the 851A is a true dual mono amplifier. By having separate circuits for the left and right channels, each channel has its own, distortion-free feed. This brings about greater separation between instruments, greater width of sound and enhanced realism.

Plenty of connections
With no fewer than eight audio inputs, the 851A is capable enough to handle even the most complex of systems. XLR balanced connections offer a professional-grade connection with compatible equipment, such as the 851C CD player and Stream Magic 6 network player. Fixed level inputs make it easy to use the Azur 851A as the front amplification as part of a home cinema system, while the large display can be programmed to name your sources, so that, for example, the PlayStation 3 input is labeled, 'PS3' rather than 'Aux 3'.

Full metal casing
Using a full metal casing with rounded edges, doesn't just look and feel good, it helps the sound, too. The case is rigid and well damped, so it won't resonance unhelpfully. The thick aluminium front panel looks the part and also acts as a shield against electrical interference from sources such as dimmers and RF devices. All these details combine to create an amplifier that not only looks stylish but also offers exceptional resistance to both mechanical and electrical interference.

To experience music more vividly than ever before, the Cambridge Audio Azur 851A provides your front row seat.

More Information
Analogue RCA Inputs 8
Audio Outputs 2
Bluetooth No
Coaxial Digital Inputs No
Dimensions WxDxH 430 x 385 x 115
Dimensions WxHxD (mm) 430 x 115 x 385mm
DLNA Compliant No
Frequency Response 10 - 50,000
Headphone Output Yes
Internet Radio Services No
Loudness Control No
MP3 Front Input No
Optical Digital Inputs No
Phono Input No
Power Amp In No
Power Consumption- Normal Use 800
Power Consumption - Standby 0.5
Power Output - Watts per CH 120 x 2
Pre Output Yes
Remote Control Yes
Speaker Sets 2
Sub Output No
Tone Controls Yes
Tuner Radio No
USB Input No
Weight (KG) 15
Wireless Connection No
XLR Inputs 2
Brand Cambridge Audio
Colour Black
Rated 5 out of 5 by from Cambridge Azur 851a Purchased it a week ago now,Very impressed with the sound it pushes out when we're listening to our Sony map S1 or our TV
Date published: 2017-10-08
Rated 5 out of 5 by from Effortless Bass, Sonic Separation, Audiophile Heaven! So you’re reading this review for one reason, and one reason alone. Q: Should I part with £1200, is the 851A really worth it? The short answer is most definitely yes!! I partnered the 851A with the 851N, and boy was I blown away. As soon as you turn the dial you know you have purchased something quite special. The soundstage is incredible. The bass is effortless, clear, defined, and dynamic. The midrange is wonderfully separated, not muddled or overcrowded by the bass, allowing vocals to emanate and breathe. And most surprisingly, the Cambridge equipment still had room in the locker for the sonic separation of the high end frequencies. Playing Christine & The Queens Chaleur Humaine by the 851N is quite simply incredible. The reproduction of ‘No Harm is Done’, from the thumping bass to the sweet vocals, tailored with the high frequencies bouncing around the room makes me smile constantly, and all my friends too! Treat yourself, buy the 851A, you will not regret it!!!
Date published: 2017-01-30
Rated 1 out of 5 by from Cambridge Audio Azur 851A Purchased this amp from your Glasgow shop within the last 10 days. Alan from the store set up the Amp and all the other separates like CD Player,Turntable etc on Thursday 22nd December. Working fine on Thursday andFriday then on Christmas Eve no sound at all from any source that is connected to the amplifier coming from the speakers. I have checked all connections and nothing has been changed since the original set up. At the moment I have the amp powering up but no sound to the speakers. I am sure this amp is a quality listen therefore at the time of writing this I cannot give a review. I now have to go back to store and tell them of my problem. I am sure they will solve this as I have purchased many products over the years as I am familiar with the store since it opened. Thank You William Square
Date published: 2016-12-26
Rated 4 out of 5 by from Find your feature No problems with the output quality, obviously very good. Much vaunted features are a tad more difficult to appreciate, unless you either have a Richer Sounds expert on hand all day, or can spend many hours experimenting/rambling in menus. May be a nerd thing, but as I have a life and do stuff and meet people, I maybe don't have the dedication to digital technology. Still, very good reproduction, for broadcast and disc sources. Lots of detail and separation.
Date published: 2016-12-13
Rated 5 out of 5 by from A fine amplifier Following an inheritance I had decided to spruce up my hifi. First to go was the amp, to be replaced by The Cambridge Audio Azur 851A. With its array of analogue inputs both balanced and unbalanced and record output this suited my purpose and the difference in sound quality was immedietly noticed. Much more punchy and detailed than my old Rega. Next to go were the speakers to be replaced by some Kef LS50s from another retailer. Lastly my old Denon CD player was starting to fail to play some CDs so I guess the laser is on its was out. I borrowed the demo Cambridge Audio Azur 851C from Richer Sounds Romford. Not only a CD player but also D/A converter with an array of digital inputs, not cheap at 1200 quid. It did sound good through the amp and speakers but so did my old Denon. In fact I could detect no difference between each machine. I was grateful that Richer Sounds Romford refunded me the cost of the 851C.
Date published: 2016-02-08
Rated 5 out of 5 by from excellent build quality coupled with sound quality that more than justifies the purchase price Slowly getting round to updating my old system & wanted a good amp. Read the reviews on this unit & arranged a demo at the Norwich branch (top guys there). It was delivered early the following week. Really impressed by the build quality & the reassuring weight! Set it all up & had a listen. I have a 'budget' azur 640c c/d player & old Tannoy DC 2000 speakers #remember them?#. It still sounded far better than I expected, superb stereo separation, much more detailed sound & a generally warmer more involving sound too. How much better will it sound when I change the c/d player & speakers? This has really reignited my interest in hi-fi again. Very pleased!
Date published: 2015-08-23
Rated 4 out of 5 by from excellent sound at a price Beautiful clear sound. Unit very heavy and gets vet hot Thought might be louder, although high volume is loud enough Expensive. Note: one of the feeds stopped working without explanation. Richer Sounds changed the whole unit without a fuss. Without an Amp for only 3 days. Not what I would expect with such a pricey piece of kit but good customer service.
Date published: 2015-05-15
Rated 5 out of 5 by from This amp produces a great sound I bought the amp to power my digital library from my PC on my desk. I paired it up with Focal bookshelf speakers and cambridge audio mini speakers behind me. The combo produces excellent quality audio at all volumes and does not lose quality at lower volumes. The bass element is all you could ask for. For what I need it is probably over the top, but you only live once, so you may as well enjoy great reproduction of your favourite sounds.
Date published: 2015-04-16
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£1,399
Cambridge Audio Stereo Amplifier is rated 4.3 out of 5 by 9.
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Buy in-store & take it home today! Find store details Buy by phone Call our UK based team on 0333 900 0093

We'll happily come to you!

Our experienced advisors are able to visit you at your home or place of work today, to help select the right equipment at the best prices.

6 Year Supercare £139.90

6 YEAR SUPERCARE COSTS JUST £9.99 ON ALL ITEMS UNDER £100, OR 10% OF PURCHASE PRICE ON ANYTHING OVER £100.

We think you’ll agree that our Supercare guarantee offers fantastic value. What’s more, if you don’t use our it in the 6 year period, we’ll refund the cost of it. You really can’t say fairer than that!
Plus, if we can’t fix a fault, we will give you a like-for-like replacement.
Find out full details here.

Add our Supercare to your basket when you check out. We'll cover your items for 6 years and give you your money back if unused.

Free UK delivery

Next day delivery and timed options available for online purchases of selected products. Please see checkout for further details.

Buy now, pay later For purchases over £500, pay a 10% deposit now and the balance in 6 months. Pay the balance in full before the end of the 6 months and there is no interest to pay whatsoever, just a one-off settlement fee of £29. Find out more

We offer 6 month interest free options. Call or ask in-store for details

Lowest price guaranteed! We're confident that our prices are amongst the very keenest out there, so we've made it as easy as pie to qualify for our Price Beat. Richer Sounds also guarantees to beat web prices, and Price Beat is even valid for 7 days after purchase, so if you've seen a cheaper price, let us know, and we'll happily beat that price by up to £100!

Products must be brand new, boxed, carry a comparable guarantee and be in stock at time of purchase. Richer Sounds price used to compare will be net of any voucher / trace in discounts.
T&Cs apply

We’ll beat any genuine advertised price, even from the web & give you up to £100!

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