Cambridge Audio AZUR 851W (Black) Stereo Power Amplifier

Cambridge Audio AZUR 851W (Black)

Stereo Power Amplifier

In stock
0% Interest Free Credit
£1,299

Richer Sounds exclusive model.

When combined with the equally impressive 851E or 851D, the Cambridge Audio 851W power amplifier is quite simply the best sounding Cambridge Audio amplifier ever.


Massive power for effortless sound

Take a look at the figures and it soon becomes clear that, when it comes to power, the 851W isn't going to take any prisoners! With a genuine 200W per channel at 8 ohms the 851W has a cast iron grip on any speaker, no matter how difficult the load. With a 4 ohm load this figure increase to 350W per channel. Use two 851Ws in bridged mono mode and these outputs increase to a jaw-dropping 500W (8 ohms) or 800W (4 ohms) per channel.

Twin toroidal transformers
At its heart, the 851W is powered by twin toroidal power supplies. Separate transformers for the power amplification and input ensure the audio performance is unaffected by large current requirements from powerful and dynamic music from current-hungry speakers. What this means in terms of sound quality is deep, effortless bass with thunderous dynamics on tap.

Terrapin impedance buffering
Cambridge Audio's own Terrapin impedance buffering modules replace the more commonly used op-amps for a further leap in audio quality. Terrapin impedance buffering modules separate amplifier and signal impedance, delivering an even and consistent sound with enhanced separation and imaging.

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

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 resonate 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.

For an amplifier with power to spare yet the finesse to impress, the Cambridge Audio 851W is in a league of its own.

Read about the Cambridge Audio Azur 851W on the Richer Sounds Blog

6 Year Supercare Guarantee
£129.85

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

Lowest price guaranteed!

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

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 / trade in discounts.
T&Cs apply

Buy now, pay later available
by phone, on items over £500

We offer 6 month interest free options. Call our Telesales team for details.

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. Subject to application, financial circumstances and borrowing history. Ts&Cs apply. 19.9% APR representative. Find out more

 Disabled assistance

All products that are available to purchase on the Richer Sounds website can be delivered free to blind, partially sighted or those with a disability.

Please contact web after sales for more info.
For delivery of in-store only deals, please contact your local store for more details.
T&Cs apply - see our delivery page.
18 months 0% Interest Free Credit is available on this Stereo Power Amplifier from telesales only, please call for details. Terms and conditions apply. Subject to application, financial circumstances and borrowing history. Click here for more info.
Offer excludes Clearance, Refurbished and Open Box products.


Richer Sounds exclusive model.

When combined with the equally impressive 851E or 851D, the Cambridge Audio 851W power amplifier is quite simply the best sounding Cambridge Audio amplifier ever.


Massive power for effortless sound

Take a look at the figures and it soon becomes clear that, when it comes to power, the 851W isn't going to take any prisoners! With a genuine 200W per channel at 8 ohms the 851W has a cast iron grip on any speaker, no matter how difficult the load. With a 4 ohm load this figure increase to 350W per channel. Use two 851Ws in bridged mono mode and these outputs increase to a jaw-dropping 500W (8 ohms) or 800W (4 ohms) per channel.

Twin toroidal transformers
At its heart, the 851W is powered by twin toroidal power supplies. Separate transformers for the power amplification and input ensure the audio performance is unaffected by large current requirements from powerful and dynamic music from current-hungry speakers. What this means in terms of sound quality is deep, effortless bass with thunderous dynamics on tap.

Terrapin impedance buffering
Cambridge Audio's own Terrapin impedance buffering modules replace the more commonly used op-amps for a further leap in audio quality. Terrapin impedance buffering modules separate amplifier and signal impedance, delivering an even and consistent sound with enhanced separation and imaging.

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

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 resonate 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.

For an amplifier with power to spare yet the finesse to impress, the Cambridge Audio 851W is in a league of its own.

Read about the Cambridge Audio Azur 851W on the Richer Sounds Blog

Brand Cambridge Audio
Colour Black
Power Amplifier Yes
Analogue RCA Inputs 1 pair (with loop out)
Phono Input No
MP3 Front Input No
Optical Digital Inputs No
USB Input No
XLR Inputs 1
Power Amp In Yes
Audio Outputs RCA + XLR Loop output
Pre Output No
Sub Output No
Headphone Output No
Speaker Sets 1 (Twin for bi-wiring)
Power Output - Watts per CH 200 x 2
Tone Controls No
Loudness Control No
Tuner Radio No
Remote Control No
Dimensions WxDxH (mm) 430 x 365 x 148
Weight (KG) 19
Power Consumption - Standby 1
Power Consumption- Normal Use 2400
DLNA Compliant No
Wireless Connection No
Internet Radio Services No
Bluetooth No
Freq Response (Hz) 5 - 80,000
XLR Balanced Outputs Yes (loop)
Rated 5 out of 5 by from Great Investement to boost Audio and AV experience Wow dramatic improvement to my audio and AV experience, an investment but worth every penny.
Date published: 2020-05-10
Rated 5 out of 5 by from As a stereo amp this a good, as monoblocks this is I have added a second and run them in bridged mono mode. The sound is transformed. It was good now it is breath taking. Control, finesse, everything.They do run hot and they do use electricity, but you cannot get something for nothing.
Date published: 2018-10-05
Rated 5 out of 5 by from 851W/851N/CXC & Tannoy Precision 6.4's I have had this power Amp coming up a year now, along with the 851N and have recently just added the CA CXC and Tannoy Precision 6.4 speakers to the system. I am in love with the sound, with a good quality recording on show the system sounds divine. Now everything has had time to bed in and run in including the balanced interconnects and good quality high grade copper speaker cable, tried a few different brands but in the end Van damme Hi fi cable gives the warmth and detail I like. The 851W is a beast, it drives wonderfully with a great soundstage, paired with the 851N it is a truly special combination. I did have to send my 851W back for repair due to a problem with the protection system but Richer sounds sorted it all out and I am so pleased to have my Amp back. My Tannoy precision 6.4's really do sound beautiful and this Amp powers them effortlessly, even at low volume levels it sounds wonderful. I am a very happy bunny now my system has finally come together after months of saving for the finishing touches. The system is so good, with good source material I haven't heard better, I love it.
Date published: 2018-09-22
Rated 5 out of 5 by from Cambridge Audio 851W All good! Working very well with Cambridge Audio 851N and Monitor Audio Silver 500 Speakers
Date published: 2018-06-12
Rated 5 out of 5 by from Excellent value for money Paired with my CXN V2 Preamp and sounded fantastic. My speakers are Kef Q900 and I wasn't aware they could sound so much better! It looks great and well worth the price. Packed with power and punch, doesn't disappoint to any genre of music.
Date published: 2018-01-31
Rated 5 out of 5 by from Cambridge Audio Azur 851W I have an Azur 851N - superb streamer - and a pair of Focal Aria 936 speakers, which are just fabulous - so detailed, clean and musical. Just wonderful to listen to if you have the room size (they are rather large). I was running them with a Technics SU-A900 amplifier from 1992, and the combination produced a very clear sound, but didn't seem to be getting the best out of the Focals' bass drivers, especially at lower volume listening levels. So I decided to get up-to-date and added the 851W, with the 851N as its pre-amp as I don't need analogue inputs. This power amp has certainly fixed the bass issue as it provides loads! The abiding impression is the sheer power of this amplifier. It drives the large Focal speakers so easily and with such clarity. I am very impressed.
Date published: 2017-10-30
Rated 5 out of 5 by from The last piece in the jigsaw This Cambridge 851W power amplifier completes my hi-fi. It really is a fine piece of kit and enhances the rest of my system
Date published: 2017-09-22
Rated 5 out of 5 by from Exceptional value power amp Have used (and long term auditioned) various amps over the years including Acurus, Krell, MacIntosh & bought this to replace my DIA 100 MkII (Stereophile mags best integrated amp under $1000 a while back). I needed more power (don't we all) to drive Magneplanar MG1.6QR speakers with 851N as a source. Maggies are a difficult load (around 4 Ohms impedance). What did I gain: significant bass extension, which I liken to the music being built on a massive stone foundation instead of being like built on breeze blocks if you get the inference. What did I lose: apart from the money absolutely zero, all the space, air, separation, neutrality is there. Although I no longer have it I sounded very reminiscent of a Krell amp. But it is very neutral. To hear my Maggies after many years being driven at full steam with this kind of power reserve is fabulous. Build quality is excellent, though it looks a bit boring. Despite the price it is very good value if you compare power and performance.
Date published: 2017-06-30
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£1,299
Cambridge Audio AZUR 851W (Black) is rated 4.8 out of 5 by 18.
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Buy by phone Call our national Telesales team on
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Please call your local store Members of our team are happily working from home to provide advice, info on stock and other help. They can also process sales and arrange delivery direct from our warehouse.

6 Year Supercare Guarantee
£129.85

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

6 YEAR SUPERCARE GUARANTEE 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.

Lowest price guaranteed!

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

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 / trade in discounts.
T&Cs apply

Buy now, pay later available
by phone, on items over £500

We offer 6 month interest free options. Call our Telesales team for details.

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. Subject to application, financial circumstances and borrowing history. Ts&Cs apply. 19.9% APR representative. Find out more

 Disabled assistance

All products that are available to purchase on the Richer Sounds website can be delivered free to blind, partially sighted or those with a disability.

Please contact web after sales for more info.
For delivery of in-store only deals, please contact your local store for more details.
T&Cs apply - see our delivery page.