Cambridge Audio Azur 840W (2007–2008)
At 19.1kg, it lands on the rack hard. This is not a background player for the living room. It is a heavyweight built to drive difficult loads.
Overview
The Cambridge Audio Azur 840W is a stereo power amplifier that can be bridged to work as a monoblock. It weighs 19.1kg (42.1lbs), and it was clearly engineered for performance over portability. It was released in 2007-2008 as part of Cambridge Audio's push into high-end separates under the Azur line. That push was spurred by a technical partnership with Anagram Technologies during development of the 840C CD player. The partnership led to a full set of components - the 840A integrated, the 840E preamp, and finally this amplifier - each aiming for reference-grade transparency at a price below some of its more vaunted competitors. Users describe it as "hi-rez, transparent, powerhouse," and say it keeps a firm grip on speakers. The fascia is brushed silver.
It's not flashy, but it's packed with functions. Owners report that nearly every conceivable option - and a few they wouldn't have conceived - has been included. The front panel carries status indicators for STANDBY/ON, OUTPUT, PROTECTION, CLIPPING, BRIDGED, and MONO. Inputs come in two types, RCA and XLR, with a clearly marked toggle switch for each channel to select between them. That helps if you mix balanced and unbalanced sources. The output terminals are described as "easily gripped," and the detachable IEC power cord can be swapped without soldering. It runs on 230V, which points to a European-market focus, though other voltage variants may exist.
Specifications
| Manufacturer | Cambridge Audio |
| Product type | Power amplifier (can be configured as monoblock) |
| Power output | 120W into 8Ω, 200W into 4Ω |
| THD | THD+N: <0.002% at 1kHz, 120W into 8Ω |
| Frequency Response | 20Hz - 20kHz ±0.2dB |
| S/N Ratio | >105dB (A-weighted) |
| Inputs | both RCA (single-ended) and XLR (balanced) inputs |
| Input selection | RCA/XLR inputs are selected via a clearly marked toggle switch for each channel |
| Outputs | easy-gripped terminals |
| Operating modes | Switches for "Stereo/Mono" and "Mono Mode" versus "Biamped Mono" |
| Front panel indicators | indicators on the front for STANDBY/ON, OUTPUT, PROTECTION, CLIPPING, BRIDGED, and MONO |
| Power rating | 230V |
| Power connector | sports a detachable IEC |
| Technology | generation 2 class XD technology |
| Styling | brushed silver finish |
| Dimensions (H x W x D) | 148 x 430 x 365mm (5.8 x 16.9 x 14.4”) |
| Weight | 19.1kg (42.1lbs) |
| Sensitivity | Stereo or Mono = (for 200W 8 Ohms) 1.5V rms unbalanced |
| Trigger In | 5 - 12V AC or DC |
| Trigger Out | 12V DC @ 100mA |
| Power consumption Maximum | 2400W |
| Power consumption Active (no signal) | < 180W |
Key Features
Generation 2 Class XD Technology
The 840W uses second-generation Class XD™ technology, a proprietary topology developed by Cambridge Audio that blends characteristics of Class A, B, and D amplification. According to the manufacturer, it delivers the efficiency of switching designs while keeping the linearity and low distortion of traditional linear amplifiers.
Flexible Operating Modes with Clear Status Feedback
Stereo, mono, and bi-amped mono are selected with physical switches on the rear panel. There are no menus and no hidden functions. The split between "Mono Mode" and "Biamped Mono" likely means either true bridged mono operation or independent bi-amping of a single speaker using both channels. Front-panel LEDs confirm the operating state. BRIDGED and MONO show the mode, while CLIPPING and PROTECTION work as real-time diagnostics. For system integrators, there is a 5-12V trigger in and a 12V DC trigger out (rated at 100mA) for automation with preamps or processors. That was uncommon in mid-tier amplifiers of the period.
Modular Internal Packaging
Internal component details aren't documented in the fact sheet. One description calls the "modular packaging a thing of wonder," which suggests a layout built around serviceability and thermal management. With a 2400W maximum power draw, heat dissipation would have been a real concern. A modular design likely isolates power supplies, amplification stages, and control circuits to cut interference and simplify repair.
Historical Context
The Azur 840W grew out of Cambridge Audio's collaboration with Anagram Technologies on the 840C CD player. That partnership produced the 840A integrated amplifier first, then the 840E preamplifier, and finally this power amplifier, which completed a high-end separates chain. Positioned within the Azur line, the 840W was meant to offer European engineering with a value-conscious edge - "a European Parasound," as one observer put it, "only a bit less ambitious price-wise." It shared design language and technical DNA with its siblings.
Collectibility & Value
The 840W was originally priced at $2,500, a premium for its day that reflected its build quality and feature set. The market has cooled significantly since. A current asking price of $550 is typical on US-based audio forums, while Canadian listings appear around CA$1,200, which suggests regional discrepancies or differences in condition. According to Audiogon's Bluebook, which uses 20 Years of Hi-Fi Marketplace sales data, pricing guidance exists, though specific resale trends aren't detailed. Owners are enthusiastic. One reports, "I just went and bought one from a local dealer and I've fallen in love," and another notes, "I have two of them, left and right, for about 3 years now, and love them." No widespread failure modes or service issues are documented, though spare parts availability remains unknown.
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