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The Azur 640A is back with a raft of upgrades. It now thumps out a
whopping 75 watts thanks to a higher specification toroidal transformer.
Moreover, a chunkier heat sink allows the amplifier to dissipate more energy
and run cooler than before, meaning the amplifier can operate harder, for
longer.
The Azur 640A Vs's sensitive preamp circuitry has also been significantly
redesigned, generating lower noise and THD (total harmonic distortion), while
delivering greater levels of transparency. At the heart of these enhancements
is a completely new input PCB with buffering on every input which has
radically reduced crosstalk and provides even better imaging characteristics.
The Azur 640A also sees improvements to the power amplifier circuitry layout,
with many small but significant refinements further reducing distortion and
improving the drive capability with real world speakers.
The 640A is now Incognito Ready!
To allow seamless integration with multi-room entertainment systems, the Azur
640A now has Control Bus input and output as well as an IR emitter input.
Outputs for Cambridge Audio's new Incognito multi-room system are even
included. This enables self-amplified Incognito multi-room keypads to be
connected to the 640A allowing the hi-fi system to be shared with up to two
other rooms. Each gains local control.
All this technology is housed on Cambridge Audio’s hugely respected low
resonance, acoustically damped chassis, which takes in a thick aluminium
front panel. Here you’ll find changes to the volume, tone and balance
controls, with new pots offering better feel, as well as greater accuracy and
improved channel matching at low volumes.
There’s also a heavier steel skin on the main volume knob adding greater and
a better feel. Completing the upgrades is a highly ergonomic navigator style
Azur remote handset.
The new 640A is available in silver or black.
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Azur 640A
(Version 2) specifications
- Loudspeaker
Impedance:
- Line:
- Phono (using optional phono stage):
- Total Harmonic Distortion (into 8
Ohms 80% rated power):
- Frequency
Response:
- Bass:
- Treble:
- Signal to Noise Ratio (No
weighting):
- Slew Rate (into 8ohms):
- Max. Power Consumption:
- Dimensions (mm):
- Weight:
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75 watts into 8 Ohms
100 watts into 4 Ohms
4 to 8 Ohms
330 mV
1.75mV
0.008% THD (No weighting) @ 1kHz
0.005% THD (A weighted) @ 1kHz
0.02% THD (No weighting) @ 20Hz - 20kHz
5Hz to 50kHz +/- 1dB
+/- 10dB @100Hz
+/- 10dB @10kHz
92dB
30V/uS
515 Watts
430 x 320 x 100
7 kg/15.4 lbs
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Cap5 - Cambridge
Audio Protection
CAP5
(Cambridge Audio Protection 5) is an innovative and intelligent protection
system. It constantly monitors your amplifier, without degrading signal
purity, ensuring ultimate reliability. This incorporates a clipping sensor
that reduces volume to keep levels in a safe range. There is also
short-circuit detection and a solid-state temperature sensor with over-heat
cut out. Combined these technologies ensure your Cambridge Audio Azur
amplifier will deliver years of reliable high performance.
A proprietary non-invasive five-way protection circuit CAP5 was the subject
of a separate research and development programme within Cambridge Audio. The
aim was to develop a highly innovative protection system that would not affect
the sound quality of our amplifiers.
The five detection mechanisms are detailed below:
1-Perhaps most innovatively the circuit measures the distortion of the output
signal relative to that of the input. This means the CAP5 circuit is able to
tell when the unit is being driven to hard and apply the protection. The
mechanism triggers a two-stage response. For small excursions into clipping,
CAP5 'nudges' down the volume control. For gross clipping the CAP5 protects
the unit by going into Standby.
2-The circuit constantly measures the DC level at the output terminals. It
immediately disconnects the speakers if any DC is detected. This protects the
attached speaker in the event of an amplifier fault.
3-The circuit constantly monitors the current in the output stage and the
voltage across it. It ensures levels remains within a safe operating area.
The CAP5 immediately protects the amplifier should this be exceeded.
4-The circuit measures the temperature of the internal heatsink. If this
exceeds a set temperature reading the unit is shut down.
5-Each time the amplifier is turned on, CAP5 measures the resistance across
the speaker terminals. It checks for a short every time the unit is turned on
before allowing use. The most likely time this occurs is when a customer
changes his/her speakers.
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