Troubleshooting

A low hum or buzz sound can be heard

Power cords or lighting placed near this product.

Analogue inputs not connected securely.

Sound is not audible from one channel

Speaker connections disconnected.

Speaker set to “None” in OSD setup menu.

Sound cuts off when listening to music or there is no sound even though power is ON

Speaker impedance is less than prescribed for the 650R. The unit is not adequately ventilated and may be overheating.

Low bass or “phasey” response

Speaker polarity (+/-) of one or more speakers is reversed.

An unusual hissing noise is heard when listening to a radio broadcast in stereo, but not heard when listening in mono

A slight noise may be heard because the method used for modulation of FM stereo broadcasts is different than that used for mono broadcasts.

Aerial quality also effects the level of hiss heard.

Noise is excessive in both stereo and monaural radio broadcasts

Poor location and/or direction of the antenna.

Transmitting station is too far away.

No sound from the rear speakers

Source being played is not recorded in surround sound.

Speaker/s set to “None” in OSD setup menu.

A stereo mode has been selected.

No sound from the centre speaker

Centre speaker has been set to “None” in OSD setup menu. A stereo mode has been selected.

No sound from the subwoofer

Sub has been set to ‘Off’ in the OSD setup menu or via the remote.

DTS Neo:6, DD PLII/IIx modes (which have no LFE channel) have been selected with all speakers set to “Large”.

Remote control is not working

The batteries are flat.

The remote is too far from the receiver or out of the effective range.

No sound from speakers when connected to a digital input

Audio input type is set to analogue (check display). Press the Audio Input Type button to switch to digital.

No sound from speakers when connected to an analogue input

Audio input type is set to digital. Press the Audio Input Type button to switch to analogue (check display).

Audio input type can also be set in the Input/Output Setup menu of the OSD.

No Sound from any speakers

Receiver is set for ‘Pre-out’ operation (See para 7.1).

By entering the OSD menu, selecting the input/output setup menu, the Preamp out setting can be changed from ‘Normal’ to ‘Pre-out’. This disables the internal amplifiers when an external decoder amplifier is being used. Reset this to ‘Normal’ to restore sound.

No Sound from front speakers, but rear speakers work

Receiver is set for ‘Ext 2Ch’ operation (See para 7.1).

By entering the OSD menu, selecting the input/output setup menu, the Preamp out setting can be changed from ‘normal’ to ‘Ext. 2 Ch’. This disables the internal amplifiers for the front channels when an external amplifier is being used to drive those channels. Reset this to ‘Normal’ to restore sound.

Maximum or Minimum (mute) volume level can no longer be achieved. (Display will not reach 0db or - 89db)

If the front left and right channels are adjusted using the OSD Level Calibration (balance) settings up or down to provide an off-centre front sound stage the result is that the maximum and minimum volume setting (the setting and the db level displayed, not the actual amount of volume achievable) is naturally limited by the same degree. (A small red ‘BAL’ icon appears on the front panel display to show channel balance is now off- centre). For example, adjusting the right channel to +10db will mean that the maximum sound level is now reached when the display shows -10db (not 0db as expected). Readjust the front right and left levels back to 0db to restore full volume excursion.

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Cambridge Audio 650R user manual Troubleshooting
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650R specifications

The Cambridge Audio 650R is a high-performance AV receiver designed to deliver an immersive audio-visual experience suitable for both home theater enthusiasts and casual viewers alike. With a blend of style, functionality, and state-of-the-art technology, it stands out in the crowded market of home audio equipment.

One of the standout features of the 650R is its impressive amplification capabilities. With 7.1 channels of amplification, it can deliver a powerful output of 100 watts per channel, allowing users to enjoy crisp and dynamic sound reproduction. This capability ensures that both dialogue and action sequences are clear and impactful, making movies, music, and gaming experiences truly captivating.

The 650R incorporates advanced audio technologies, including the renowned Dolby TrueHD and DTS-HD Master Audio, providing users with a lossless audio experience that truly captures the nuances of the original recording. This ensures that content is played back in the way it was intended to be heard, enhancing the overall enjoyment of movies or music.

Another significant feature is the onboard HDMI connectivity, which supports 3D video and 4K pass-through, offering compatibility with the latest video formats. The receiver is equipped with multiple HDMI inputs, allowing easy integration with various devices such as Blu-ray players, gaming consoles, and streaming services, ensuring a seamless user experience.

Cambridge Audio also utilizes its proprietary Adaptive Gain Control technology within the 650R. This feature intelligently adjusts the audio output levels depending on the source material, providing users with a consistent listening experience across different types of media. Additionally, the 650R includes a high-quality DAC (Digital-to-Analog Converter), enhancing audio clarity, and ensuring that even the most minute details of the soundscape are brought to life.

The design of the 650R is not only aesthetically pleasing but also user-friendly. The intuitive interface and easy-to-navigate menus make setup and operation straightforward, serving both novices and audiophiles. Furthermore, the receiver is optimized for versatility, supporting various speaker configurations, including bi-wiring and bi-amping, which allows for greater customization based on individual preferences.

Overall, the Cambridge Audio 650R stands as a testament to quality engineering in the realm of home audio. Its combination of powerful amplification, advanced audio processing, versatile connectivity options, and elegant design makes it a prime choice for anyone looking to enhance their home entertainment system. Whether watching movies, listening to music, or gaming, the 650R ensures a rich and engaging experience that is hard to match.
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