Azur 840A Class XD™
Integrated Amplifier

Cambridge Audio breaks new ground with an entirely new class of amplifier in the shape of the 840A which marks the zenith of Cambridge Audio’s critically acclaimed Azur line-up.

Embracing Cambridge Audio’s patent pending proprietary Class XD™ technology, the 840A brings together the quality of Class A amplification, the power economy of Class B designs, and most amazingly of all, avoids many of the distortion pitfalls inherent in Class AB designs.

Click here to read an exclusive Hi-Fi World interview with the designer of Class XD technology

Completely separate pre-amp and power amp toroidal transformers and circuits make the 840A effectively a pre and power amplifier combination in one chassis

Another enormous benefit is its ability to integrate seamlessly with a home cinema system. Fixed level inputs allow the 840A to provide the front channel amplification to systems which use an AV receiver. The receiver continues to provide centre and rear amplification.

In addition to this innovative technology, the 840A uses an extremely sophisticated resistor ladder and relay attenuator for volume control and the same high quality relay switches for input selection. This enables high isolation between inputs, very accurate channel balance and leaves the amplifier completely free from the distortion associated with conventional semiconductor switching and volume control.

As with all Azur products, the foundation of the Azur 840A's strength is a bespoke chassis. This comprises an incredibly thick 7mm front panel and extruded side panels, both fashioned from aluminium, which combine with a 2mm formed steel base plate and specially designed vibration absorbing feet. The result is an ultra rigid, low resonance, acoustically dampened platform for the electronics to sit in.

Subject of many in-depth reviews in the hi-fi and specialist electronics press, the 840A recently won Hi-Fi Choice's coveted amplifier 'Ultimate Group Test' beating competitors almost three times the price!
Click here to read the review


Great attention has been paid to ensure that all functions can be operated from the stunning aluminium-faced Azur Navigator remote. As well as offering full control over all the 840A's features and functions, this neat handset also enables track skip plus play and pause of iPods™ connected to Apple's iPod Universal Dock

Azur 840A Class XD amplifier features

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