High Quality Sound Reproduction: The Cambridge Audio Azur 651A
integrated amplifier has been designed and engineered to deliver the purest, most
realistic sound reproduction possible; free from interference or distortion.
Full Metal Chassis: The 651A integrated amplifier features an
acoustically damped, low resonance full-metal chassis with a thick, brushed aluminum
75W x 2Ch Integrated Amp: The Cambridge Audio Azur 651A delivers
an impressive 75 watts per channel into 8 ohms, at 20-20kHz, with 0.03% THD at 80%
Fully Discreet Amplifier Circuitry: The 651A integrated amplifier
has separate transformers for left and right channels, twin rectifiers, and separate
PSUs for dual mono operation of the left and right power.
ALPS " Black Box" Volume Encoder: The 651A 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.
Toroidal Transformer: Unlike a lot manufactures who use cheap
laminate type transformers, the 651A use an audiophile grade toroidal transformer
offering minimal electro magnetic interference and delivering superior audio
Heat Sink: The 651A integrated amplifier features substantial
extruded heat sinks, allowing the amp to deliver incredible power and control.
New low inductance resistors and
polypropylene signal capacitors are used for superior audio performance.
Buffered Input Circuitry: The 651A features buffered input
circuitry for superior audio performance, including lower crosstalk and improved
stereo imaging. It also uses new low dissipation polypropylene signal capacitors
and custom made electrolytic capacitors in critical positions.
Redesigned Output Stage: The 651A integrated amplifier uses
completely redesigned output stages with new Sanken output transistors, improving
bass response and dynamics even further.
5-Way Protection System: Cambridge Audio has developed
a proprietary protection system to ensure reliability and long life of its
amplifiers. This proprietary protection system is known as "CAP5 protection
circuitry". This protection system comprises five main protection methods:
- DC Detection: CAP5 offers loudspeaker
protection if the output of the amplifier goes to a high
constant voltage (DC).
- Over Temperature Detection: AP5 includes
temperature detection which constantly monitors the heat generated
by the output transistors. If the monitored temperature reaches a
high level (suitably within the limits of the output devices) the
amplifier will automatically switch into a fault mode.
- Over Voltage Detection: CAP5 offers V/I
protection by constantly monitoring the output transistors to
keep them working inside their Safe Operating Area (SOA). The
SOA is a set of limits given by the output transistor manufacturer
to ensure reliability. V/I also protects the amplifier against
short-circuits on the speaker terminals during use.
- Short-Circuit Detection: During power
up from Standby, CAP5 performs a check on the loudspeaker
terminals to see if a short across the terminals has been
accidentally introduced. If the resistance measured across
the loudspeaker terminals is too low, the unit will remain
in Standby mode until the fault has been removed and power
up is re-attempted.
- Intelligent Clipping Detection: CAP5
has the ability to detect when the amplifier starts to clip
or overdrive at its output, which can damage loudspeakers
and degrade the sound. Clipping distortion is caused at
high volume levels when the output signal briefly goes
outside the maximum voltage that the amplifier can provide,
causing the tops of the signal to flatten off. When CAP5
detects clipping, the volume will be automatically nudged
down until CAP5 detects an undistorted output.
Standby Circuit: This innovative new circuitry design allows
651A integrated amplifier to consume less than 1 watt of power when in Standby,
but itself remains totally isolated and non-detrimental to the sound quality when
the amplifier is in operation.
Main Power Switch: The 651A integrated amplifier's main power
on/off switch is located on the rear-panel.
Standby/On: Once the amp's rear-panel main power switch has
been turned On, you can switch the 651A On/Off using the front-panel Standby/On
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, the preamp output, and the
headphone output. It does not affect the Rec Out connections.
A/B Operation: The Cambridge Audio 651A 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 651A 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 and preamp 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 and preamp outputs; it does not effect the record outputs.
IR Remote Control: The 651A is supplied with an Azur Navigator
IR remote control that operates both this amplifier and Cambridge Audio Azur-series
CD players. The Azur 651AC 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).
Note: The remote operates off of three
"AAA" batteries (supplied).
Analog Audio Inputs: The Cambridge Audio 651A 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.
Note: The 651A integrated amp is not equipped
with digital inputs/outputs or video inputs/outputs. There is also
no Phono input.
Analog Audio Outputs: The 651A integrated amplifier features
two pair of gold-plated analog audio outputs (RCA) that can be connected to a CD
recorder, MiniDisc recorder, or tape recorder.
Front-Panel Aux Input: The Cambridge Audio 651A integrated
amplifier features a front-panel Auxiliary (3.5mm) input to connect your portable
MP3 player or other portable audio device.
USB Port: The 651A 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 651A 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.
Note: When using two pairs of speaker, use
only speakers with a minimum nominal impedance of 8 ohms.
Subwoofer Output: The 651A integrated amplifier is equipped with
a mono subwoofer output to connect a powered subwoofer for added bass response.
Preamp Output: The Cambridge Audio 651A is equipped with a
pair of RCA preamp outputs to connect the integrated amp to an external power
Record Outputs: The 651A also features two pair of gold-plated
analog audio record outputs (RCA) that can be connected to a CD recorder, MiniDisc
recorder, or tape recorder.
Headphone Output: The 651A 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.
IR Emitter: The 651A features a IR Emitter input (3.5mm) which
allows modulated IR commands from multi-room systems or IR repeater system to be
received by the amplifier.
Control Bus: The 651A features a Control Bus Input and Output
(RCA), which allows un-modulated commands from multi-room systems or other components
to be received by the amp and loop out to another unit.
AC Power Cord: The Cambridge Audio 651A operates off of standard
household AC current using the supplied detachable 6' AC power cord.
Azur Series CD Player: The Cambridge Audio Azur 651C Compact Disc Player
sold separately) is the perfect companion to the 651A 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