Technical speciﬁcations Troubleshooting

Technical speciﬁcations

Troubleshooting

651A

Power output

THD (unweighted)

Frequency response (-1dB) S/N ratio (ref 1W)

Input impedances

Power Amp damping factor Max. power consumption Standby power consumption Bass/Treble controls

USB input

Dimensions (H x W x D)

Weight

75 watts (into 8Ω)

<0.002% @ 1kHz, 80% of rated power <0.03% 20Hz - 20kHz, 80% of rated power

<0.02% 20Hz - 20kHz @ 10W

5Hz - 50kHz

>92dB (unweighted)

47kohms

>100

600W

<1W @ rated mains

Shelving, ultimate boost/cut +/- 7.5dB @ 20Hz and 20kHz

USB Audio 1.0

16 bit 32kHz, 44.1kHz, 48kHz.

120 x 430 x 350mm

(4.7 x 16.9 x 13.8”)

8.4kg (18.5lbs)

There is no power

Ensure the AC power cord is connected securely.

Ensure the plug is fully inserted into the wall socket and is switched on. Check the unit is switched on at the rear panel.

Check fuse in the mains plug or adaptor.

There is no sound

Make sure the unit is not in Standby mode.

Check that the source component is properly connected. Check that your speakers are properly connected.

Check that the correct speaker outputs are switched on (‘Speaker A/B’ button on the remote control).

If source LED is ﬂashing, turn ‘Mute’ off.

There is no sound on one channel

Ensure that balance control is in the correct position.

Check speaker connections.

Check interconnects.

There is a loud buzz or hum

Check turntable or tone arm for ground and connection lead fault. Ensure no interconnects are loose or defective.

Ensure that your tape deck or turntable is not too close to the ampliﬁer.

Unable to make tape recordings

Check that ‘Rec Out’ has been connected correctly.

There is weak bass or diffused stereo imaging

Ensure that speakers are not wired out of phase.

The sound is distorted

Check that the volume or tone controls are not set too high.

Protection LED ﬂashing

See section on CAP5 protection system.

The remote handset will not function

Check that the batteries have not expired.

Ensure that nothing is blocking the remote sensor.

In the event that the above solutions do not remedy your problem, please consult our frequently asked questions (FAQ) section on our website: www.cambridge-audio.com/sts/faqs

For all servicing, in or out of warranty, please contact your dealer.

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.