Cambridge Audio 640H User Manual download pdf (Page 6)

“…Cambridge Audio has broken the

mould with its patented XD regime…”

Hi-Fi News, UK

Pre and Power Amplifiers

azur

840W – Class XD™ power amplifier

The 840W employs Cambridge Audio’s second generation Class XD active crossover

displacement technology for a ‘best of both worlds’ audio experience. Class XD

manages to fuse the musicality and expression of Class A with the dynamism and

rhythmic drive of Class AB whilst cleverly sidestepping many of the pitfalls of both

technologies. Delivering a breathtaking 200 watts per channel into 8 Ohms in stereo,

the 840W can also be used in either bi-amped or bridged mono configurations. When

bi-amping, one 840W (of the pair) powers each speaker so that the tweeters and

woofers each have their own dedicated amplifier channel. Alternatively the bridged

mono mode allows the use of two 840Ws with each configured as a 500 watt

monobloc. In fact combinations of the two regimes allow the use of 1, 2, 4 or even

more 840Ws to be used, taking the 840W into the truly stratospheric high-end.

The 840W isn’t just about power and flexibility, it’s been designed by the same team

that created the refined sound of the 840A V2 and 840C and despite the massive

power reserves and load driving ability, features a highly detailed naturally musical

performance. Truly an iron fist in a velvet glove!

840E – pre-amplifier

A high-end pre-amp, the 840E wonderfully complements the 840W’s awesome power.

Using high-performance components, Cambridge Audio’s own Terrapin™ design has

taken op amps to the next level. This proprietary discrete circuitry dramatically

reduces noise and distortion. Tone controls are selected and stored by nameable

input, which are also relay controlled.

As the pre-amp has its own power supply, it operates in isolation to the power

amplifier and does not suffer from interference, something which is also aided by

two balanced inputs. The 840E is fully specified for custom install use including

RS232 control, Control Bus In/Out and IR emitter In as well as being Incognito

Ready for instant multi-room connectivity. A trigger to automatically power-up the

840W provides total convenience.

Available late 2007

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Cambridge Audio 640H User Manual Page 6