Rear panel connections

azur 651A

ENGLISH

1Power On/Off

Switches the unit on and off. This switch is a master on/off control that completely powers down the unit.

2AC power socket

Once you have completed all connections to the ampliﬁer, plug the AC power cable into an appropriate mains socket and turn the unit on. Your ampliﬁer is now ready for use.

3Loudspeaker terminals

Two sets of loudspeaker terminals are available, A (main loudspeaker terminals, top row) and B (secondary switchable loudspeaker terminals, bottom row). Connect the wires from your left channel loudspeaker to the LEFT positive and negative terminals, and the wires from the right channel loudspeaker to the RIGHT positive and negative terminals. In each case, the red terminal is the positive output and the black terminal is the negative output.

Care should be taken to ensure no stray strands of wire are shorting speaker outputs together. Please ensure that the loudspeaker terminals have been tightened adequately to provide a good electrical connection. It is possible for the sound quality to be affected if the screw terminals are loose.

The use of A and B speakers affords you an easy and inexpensive way to create a simple multi-room system.

Note: When using two pairs of speakers, use speakers with a minimum nominal impedance of 8 ohms.

4IR (Infrared) Emitter In

Allows modulated IR commands from multi-room systems or IR repeater systems to be received by the ampliﬁer. Commands received here are not looped out of the Control Bus. Refer to the ‘Custom Installation’ section for more information.

5Control Bus

In Allows un-modulated commands from multi-room systems or other components to be received by the unit.

Out Loop out for control bus commands to another unit.

6Sub-Out

This output can be used to connect to a subwoofer, if desired.

7Pre-Out

These outputs can be used to connect to the inputs on an external power ampliﬁer or an active subwoofer, etc.

8Record Out 1/2

These two identical output sockets can be connected to a tape deck or to the analogue Record In sockets on a MiniDisc or CD recorder etc.

9S1-S5

These inputs are suitable for any 'line level' source equipment such as BD/DVD players, DAB or FM/AM tuners, CD players, Netwok Players, iPod docks, MP3 players, etc.

Note: These inputs are for analogue audio signals only. They should not be connected to the digital output of a CD player or any other digital device.

Connecting a turntable

If it is desired to connect a turntable without a built-in phono stage, an external phono stage such as our 551P or 651P models should be used. Contact your Cambridge Audio dealer for more details.

Note: A very few turntables have built-in phono stages, in which case it is not necessary to use a separate phono stage ampliﬁer. If you’re unsure, please consult your turntable user manual.

10USB interface

A USB B type socket is ﬁtted to the 651A to enable the playback of audio from a personal computer running either Microsoft Windows or Apple Mac OS X operating systems. Some builds of Linux are also suitable.

Note: Always use a certiﬁed cable for USB Audio preferably one that displays an ofﬁcial mark. USB cable connections longer than 3m may result in inconsistent audio performance.

Always turn the Volume to minimum, or turn the 651A off before plugging/unplugging cables to the USB input or whilst booting up your PC/Mac.

651A specifications

Cambridge Audio’s 651A integrated amplifier stands as a testament to the company's dedication to providing high-quality audio performance. Designed to deliver a rich sound experience, this amplifier combines technology and craftsmanship, making it a favorite among audiophiles and casual listeners alike.

One of the key features of the 651A is its Class AB amplification design. This technology ensures that the amplifier produces a warm and dynamic sound, with plenty of detail and clarity. The output power of 75 watts per channel at 8 ohms makes it capable of driving a wide range of speakers, providing impressive dynamic range without distortion.

The 651A is equipped with a high-quality digital-to-analog converter (DAC), which enhances the audio signal from various sources, including digital music players and computers. This DAC is especially beneficial for users who want to enjoy superior sound quality from their digital library. The amplifier also includes multiple inputs, such as five line-level connections and a dedicated phono stage for turntables, allowing users to connect their favorite sources with ease.

Cambridge Audio’s 651A features a comprehensive power supply designed to deliver steady and clean power to the amplifier. This is crucial for maintaining audio integrity, especially during demanding musical passages. The heavy-duty toroidal transformer plays a vital role in this aspect, providing efficient power distribution for optimum performance.

In terms of build quality, the 651A boasts a robust and stylish chassis that not only enhances its aesthetic appeal but also minimizes vibration and interference. The intuitive front-panel design includes a large volume knob and source selection buttons, making it easy to navigate through various inputs.

Additionally, the 651A incorporates advanced technology such as the proprietary Cambridge Audio Adaptive EQ. This feature allows the amplifier to optimize sound quality based on your listening environment, ensuring that you always enjoy the best possible audio experience.

Overall, the Cambridge Audio 651A integrated amplifier combines high-quality components with advanced technology, resulting in a product that offers remarkable sound performance and versatility. Whether you’re enjoying classic vinyl records or streaming the latest digital hits, the 651A provides an immersive listening experience that stands out in the crowded audio market. This amplifier exemplifies Cambridge Audio's commitment to innovation and quality, making it a top choice for those seeking both performance and reliability in their audio setup.

Cambridge Audio 651A user manual Rear panel connections

Models: 651A

azur 651A