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Cambridge Audio Azur 351A

Stereo integrated amp with USB input (Silver)

6 Reviews | 1 question - 3 answers

Item # 779351AS

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Our take on the Cambridge Audio Azur 351A

We know the dilemma. Sometimes the ear wants more than the bank account can deliver. And you're not a person who's willing to compromise. So it's exciting to find out the wait for your dream system might be a lot shorter than you might think. Cambridge Audio's Azur 351A integrated amplifier features all the legendary build quality you'd expect from their distinguished nameplate, and plenty of clean, reliable power for the most demanding music — thanks to the heavyweight toroidal transformer found inside its chassis.

The possible dream

We know the dilemma. Sometimes the ear wants more than the bank account can deliver. And you're not a person who's willing to compromise. So it's exciting to find out the wait for your dream system might be a lot shorter than you might think. Cambridge Audio's Azur 351A integrated amplifier features all the legendary build quality you'd expect from their distinguished nameplate, and plenty of clean, reliable power for the most demanding music — thanks to the heavyweight toroidal transformer found inside its chassis.

The Cambridge Audio Azur 351A integrated amplifier's toroidal transformer

The Cambridge Audio Azur 351A's toroidal transformer is the reason you'll have plenty of clean power for your music

Everything you need and nothing you don't

Because Cambridge Audio is dedicated to giving you exactly what you need for rich, full-bandwidth musical reproduction, your hard-earned resources go exclusively toward circuitry, materials and electrical components that further the quality of your sound, and nothing more. If you're looking for a unit that will wake you with an alarm, trigger your lawn sprinkler system, or turn off with a clap, look elsewhere.

A strategy for every source

All your popular music sources will have a home. The 351A offers 6 gold-plated analog inputs (1 is a minijack on the front for media players like an iPod® or smartphone) and 1 USB input, which feeds an internal Burr-Brown DAC, allowing you to access your computer's audio files without using its noise-prone audio card. If you enjoy using iTunes® playlists or Spotify® streaming for your life's soundscape, the 351A has got you covered. And should you wish to add a turntable to your source mix, simply add a phono preamp in line ahead of one of the RCA inputs.

For a match made in audio heaven, check out Cambridge's Azur 351C CD player.

Attention to fine detail

Even something as seemingly simple as the unit's volume control has been thought through to maximize overall quality. The ALPS black-box film volume control achieves remarkable channel balance, even at very low volumes — that's a common area of dissatisfaction with less worthy components. Two sets of binding post speaker terminals will allow you to route the amp's output to speakers in two different locations, so you can enjoy your tunes throughout your living space.

Product Highlights:

  • 45 watts x 2 channels into 8 ohms (20-20,000 Hz), 0.15% THD at 80% of rated power
  • signal-to-noise ratio: >92 dB
  • toroidal power transformer for low noise and high-current output
  • separate transformer taps for left and right channels, twin rectifiers and separate PSUs for dual mono operation of the left and right power amps
  • 5 RCA line-level analog audio inputs accommodate CD players, tuners, other components
  • front-panel minijack input for connecting a portable music player
  • 1 stereo RCA record output
  • connect a turntable with a phono preamp
  • USB input accepts 16-bit, 32/44.1/48kHz signals, no drivers needed for Mac® or Windows® computers
  • infrared control input and control bus input/output for integration into multi-room systems
  • full-size headphone jack
  • remote control
  • 16-15/16"W x 3-7/16"H x 14-5/8"D
  • weight: 13.2 lbs.
  • warranty: 3 years
  • Our 60-day money-back guarantee

What's in the Box:

  • Integrated amplifier
  • 6' AC power cord
  • IR remote control (RC-351A/C)
  • 3 "AAA" batteries
  • Quick Start Guide (En/Fr/Sp)
  • Important Safety Instructions

Sounds great and I am using a raspberry pi via USB as the source and it works great. Only minor gripe is that I wish the DAC supported higher sampling rates.

MindSpawn, Minnesota


Cambridge Audio Azur 351A Reviews

Average Customer Review(s):

(6 Reviews)

Bang for the buck bar none

CraigS from Washington on 9/25/2015

Crutchfield Customer Review (What's this?)

Cambridge 351A integrated amp is clean & crisp at only 40 watts ! Mine is hooked up with high decibel sensitive speakers (wharfedale diamond 2.2's) which is the key w/ lower power watts. Don't have to have and pay for monster amp as a result, 87-93 db speakers and your golden; great purchase; Crutchfield got this to me in 5 days and I live out in the boonies in rural Washington state......thanks guys!

Pros: Quick delivery, quick e-mail confirmation from Crutchfield team, clean, sound amp ....what a stereo value


A great bargain!

Robert from Florida on 8/21/2015

First I have to say that as always the Crutchfield staff is first class.Also I received my order in just two day's! I was a little apprehensive when I opened the Crutchfield box and the Cambridge box was caved in.Then I read the "Made in China" wording on the box; but that aside the amplifier arrived intact. Well laid out and nicely finished.The set up is simple.I am using this as a dedicated amp for my Korg-Kronos-88 Synthesizer.It drives two large tower speakers and with the volume set at just a little more than one quarter it has more than enough power to "blow you out of the room".Tone controls seem very accurate and when set at their flat positions there is no need to adjust. I am using a Sony AS-2500 sub-woofer which is hooked in parallel as there is no "Sub-out" connector. This sub has a straight wire connector and the "2 plus 2" wire connectors for amps/receivers w/o the jack.This amp is being used in a small home recording studio so noise or distortion is the last thing one would want. The Cambridge has no audible distortion, making it the perfect fit for this application. I am very pleased with the value of this product.Even if it hadnt been on sale it would be a real bargain.The only "complaint" I might have would be the speaker connector terminals are a little awkward and their quality does not seem on a par with the rest of this amp. I am very happy with my purchase and of course Crutchfield's service and speed...

Pros: Great quality, design, and very conservative ratings (feels like it has a LOT more power than the 45 watts RMS advertised)

Cons: Speaker connector terminals, and poor quality packaging (shipping container).

Excellent product for the price

MindSpawn from Minnesota on 8/11/2015

Crutchfield Customer Review (What's this?)

Sounds great and I am using a raspberry pi via USB as the source and it works great. Only minor gripe is that I wish the DAC supported higher sampling rates.



Very nice Amp

Anonymous from California on 7/26/2015

Crutchfield Customer Review (What's this?)

It is a good quality Amp very happy with it is powering 4 rock speakers in my backyard. It is doing just what i wanted iot to do very happy with this Amp.



Good Amp

Anonymous from Pennsylvania on 5/31/2015

Crutchfield Customer Review (What's this?)

Construction of this amp is very Good/Excellent. At the special purchase price I had to give it a try and I'm glad I did. I have a nad 356bee DAC amp that sounds excellent and was expecting something close when I swapped it to give the CA a try. The 351A had no dynamics and sounded awful with Monitor Audio RS1's and a little better with Kef Q300's. Muffled high's and no lows. I thought I messed up polarity or something. Took it out after 1hr because it sounded terrible TO ME. I read online somewhere that said Cambridge recommends a break in period so I set up a small system in the basement and let it play for a couple of days with the door shut and some blankets over the speakers. Anyway after giving Crutchfields return policy a read I decided to give it one more try with the good system before I sent it back. I don't know if the amp broke in or worked out some issues it had but it sounds really good now. Almost as good as the NAD and the CA's built in DAC isn't half bad when you turn the computer's sample rate to 48KHZ. Going to keep it for the bedroom running with the Kef Q300's and hooked up to HTPC. It deserves 5 stars at the price I paid but it did sound bad out of the box so that takes a star.

Pros: Balanced sound Looks Great Remote works good

Cons: Would have liked an optical input as well Don't really like the linked A+B speaker configuration. Would have preferred A or B speakers but that's what a speaker selector switch is for.

Cambridge 351A

Frank O from Pittsburgh Pa on 1/8/2014

Crutchfield Customer Review (What's this?)

BOUGHT THE CAMBRIDGE 651 A BACK IN MARCH 2013 SENT IT BACK BECAUSE I COULD FAINTLY HEAR MUSIC STILL PLAYING WHEN VOLUME WAS A MIN. SO I PURCHASED THE CAMBRIDGE 351A STILL HEARING THAT FAINT MUSIC PLAYING WHEN VOLUME IS AT 0 ..the built quality is nice but its sound is not clear I compaired it to my Yamaha as 500 it sound way better I am gonna box it back up send it back and stick with my yamaha The cambridge does have a good punch of power wish it was cleaner sounding

Pros: Power and punch

Cons: Faint music still playing when volume is at 0 651 A is th The faint music still palying when volume is at 0 ..the 651a does the same thing when I tried mp3 on the front did not hear the sound at 0 Hmmm puzzles me so that is my review


Hands-on research

Features and Specs

Performance Specs
Watts RMS per Channel (8-ohms) 45
Watts RMS per Channel (6-ohms) Not given
Watts RMS per Channel (4-ohms) Not given
Frequency Bandwidth 20-20k
THD 0.15%
Minimum Impedance 4 ohms
Signal to Noise Ratio 92
Digital Music Features
Built-in DAC (Digital to Analog Converter) Yes
High-resolution Audio Playback No
Bluetooth No
Wi-Fi N/A
Total Analog Inputs 5
Phono Input No
Optical Digital Inputs No
Coaxial Digital Inputs No
USB Input Type-B
Preamp Outputs No
Headphone Output 1/4"
Dimensions and Warranty
Width (inches) 16-15/16
Height (inches) 3-7/16
Depth (inches) 14-5/8
Weight (pounds) 13.2
Parts Warranty 3 Years
Labor Warranty 3 Years

Product Research

Add-On Devices


Full Metal Chassis: The 351 A integrated amplifier features an acoustically damped, low resonance full-metal chassis with a thick, brushed aluminum front-panel.

45W x 2Ch Integrated Amp: Separate very high quality integrated circuit amplifiers are used for each channel for freedom from crosstalk and best possible stereo imaging. The Cambridge Audio Azur 351 A delivers an impressive 45 watts per channel into 8 ohms, at 20-20kHz, with 0.15% THD at 80% rated power.

Torodial Transformer + Extruded Heatsink: At the heart of the 351A lies a heavyweight, audiophile-grade toroidal transformer, a premium component chosen for its ability to offer huge power reserves, excellent bass response, depth and rich musical reproduction across the volume range. The integrated amp also offers a substantial extruded heatsink for excellent heat dissipation.

Polypropylene Capacitors: New low inductance resistors and polypropylene signal capacitors are used for superior audio performance.

ALPS " Black Box" Volume Encoder: The 351 A integrated amplifier uses a high end ALPS "Black Box: volume encoder that all of the signal goes through this at all times, so this is a very key component. Benefits include perfect channel balance at all volume levels and improved and stereo separation.

Protection Circuit: The 351A has full protection against misuse and possible faults. The overload and short-circuit protection systems continuously monitor the voltage, current, and temperature of the integrated amplifier's output devices for safe operation.


Volume: Use the front-panel rotary volume control to increase or decrease the level of the sound from the outputs of the amplifier. The volume control affects the level of the loudspeaker output and the headphone output. It does not affect the record output connections.

A/B Operation: The Cambridge Audio 351 A integrated amplifier lets you play A speakers only, B speakers only, or A and B speakers together.

Direct: This control gives the audio signal a more direct path to the power amplifier stage of your amplifier, bypassing the bass and treble control circuits for the purest possible sound quality.

Bass and Treble: The 351 A integrated amplifier has independent Bass (20Hz) and Treble (20kHz) controls which can be adjusted from +/-7.5dB. The Bass and Treble controls only effect the speaker outputs; they do not effect the record outputs.

Balance: This control allows you to adjust the relative output levels of the left and right speaker channels. The Balance control only effects the speaker outputs; it does not effect the record outputs.

IR Remote Control: The 351 A is supplied with an Azur Navigator IR remote control that operates both this amplifier and Cambridge Audio Azur-series CD players. The Azur 351 AC Navigator remote control can also control the basic functions of Apple devices, such as Apple TV and Apple's iPod/iPhone/iPad when docked in a Cambridge Audio or Apple dock (sold separately). The remote operates off of three "AAA" batteries (supplied).


Analog Audio Inputs: The Cambridge Audio 351 A integrated amplifier is fitted with five pair of gold-plated analog audio inputs (RCA) to connect your external audio sources; such as your Blu-ray/DVD player, AM/FM tuner, CD/SACD player, or Network Player. The 351 A integrated amp is not equipped with digital inputs/outputs or video inputs/outputs. There is also no Phono input.

Front-Panel Aux Input: The Cambridge Audio 351 A integrated amplifier features a front-panel Auxiliary (3.5mm) input to connect your portable MP3 player or other portable audio device.

Record Outputs: The 351A integrated amplifier features a pair of gold-plated analog audio record outputs (RCA) that can be connected to a CD recorder, MiniDisc recorder, or tape recorder.

USB Port: The 351 A integrated amplifier is fitted with a rear-panel USB (type-B) full-speed 1.1 port allowing USB audio streaming from your Windows PC (XP, Vista, 7) or Mac computer (Mac OSX 10.5 or higher). The USB port supports 16-bit/32kHz, 44.1kHz, or 48kHz audio.

A-B Speaker Terminals: The Cambridge Audio 351 A integrated amplifier is equipped with two sets of gold-plated, binding-post speaker terminals (labeled A and B). The use of A and B speaker terminals allow you to hook up speakers in another room. When using two pairs of speaker, use only speakers with a minimum nominal impedance of 8 ohms.

Headphone Output: The 351 A integrated amplifier offers a front-panel 1/4" headphone output to connect a set of headphones for private listening. When headphones are connected, the output to both A/B loudspeakers is muted. Use headphones with an impedance of between 32 and 600 ohms.

AC Power Cord: The Cambridge Audio 351 A operates off of standard household AC current using the supplied detachable 6' AC power cord.

Add-On Devices

Azur Series CD Player: The Cambridge Audio Azur 351 C Compact Disc Player (779351CS, sold separately) is the perfect companion to the 351 A integrated amplifier.

DacMagic: Get even better sound from your computer's stored music and Internet radio, as well as add optical/coaxial digital inputs to the 351 A integrated amplifier, with a Cambridge Audio DacMagic external digital-to-analog converter (779DACMPLS, sold separately).

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Q & A

Customer Q&A

1 question already asked

I have need used it yet but I don't think it has a subwoofer output.You should go to crutchfield or Cambridge audio's website! [ reggie  Jul 30, 2015 ]
There is no subwoofer connection [ Paul  Jul 29, 2015 ]
Absolutely. This is one of my proudest piece of equipment. [ JEERAN  Jul 29, 2015 ]