Front panel controls

azur 651A

4 5

ENGLISH

1 Standby/On

8 Volume

Switches the unit between Standby mode (indicated by dim power LED) and On (indicated by bright power LED). Standby is an eco power mode where the power consumption is less than one watt. The unit is designed so that it can be left safely in Standby mode when not in use.

Use to increase or decrease the level of the sound from the outputs of the ampliﬁer. This control affects the level of the loudspeaker output, the pre- amp output and the headphone output. It does not affect the Rec Out connections. It is advisable to turn the Volume control fully anti-clockwise before switching the ampliﬁer on.

2Phones

Allows for the connection of headphones with a ¼" jack plug connector. Headphones with an impedance of between 32 and 600 ohms are recommended. When the headphones are connected, the output to the loudspeakers is switched off (both speakers A and B).

3Infrared sensor

Receives IR commands from the supplied Azur remote control. A clear, unobstructed line of sight between the remote control and the sensor is required.

4Protection

LED ﬂashes to indicate activation of CAP5 protection system. Refer to the CAP5 section of this manual for more information.

5Speaker LEDs

Indicator shows the speaker terminals that are selected. The speaker terminals selected are changed with the remote control.

9Balance

This control allows you to adjust the relative output levels of the left and right channels. In the central position the output from each channel is equal. This control only modiﬁes the sound through your loudspeakers and the Pre-Out sockets – it does not affect the signals sent through the Rec Out connections.

10S1/MP3 input

This source input allows you to connect a portable audio device such as an MP3 player, plugged into either the rear panel ‘S1’ Phono/RCA input pair or the front panel 3.5mm stereo-jack input (labelled ‘MP3 In’).

Press the S1 button on the front panel to select the input, or insert a device into the front panel socket which automatically selects the input and overrides the rear Phono/RCA sockets.

Note: Whilst plugging a device into the front panel automatically selects the MP3 input, any other input can still be selected once this has been done. As a result you may, if desired, leave a device permanently plugged into the front panel.

6Direct

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.

7Bass and Treble

These controls allow subtle adjustments to the tonal balance of the sound. In the central position these controls have no effect. They only modify the sound through your loudspeakers and the Pre-Out sockets, and do not affect the signals sent through the Rec Out connections. With well-produced source material and a good system, the tone controls are unnecessary and can be switched out by the ‘Direct’ switch. If the musical recording is of poor quality or other factors are affecting the sound quality, it may be necessary to adjust the tone controls to compensate.

11S2-S5 Source inputs

Push the appropriate input selection button to select the source component that you wish to listen to. The signal selected is also fed to the Rec Out sockets so that it may be recorded. The input should not be changed whilst recording.

12USB

This source input allows connection of a personal computer via USB.

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.