Dolby Digital EX

Known also as DD (3/3) or DD 6.1, an enhanced form of Dolby Digital. On top of the discretely encoded 5.1 channels DD EX provides an extra 6th channel (Surround Back, giving 6.1) matrix encoded into the rear surrounds for greater image depth and more solid sound localisation behind the listener.

DDEX requires a DD EX encoded disc. DD EX is backwards compatible with DD 5.1 decoding. If DD EX is decoded as normal DD the Surround Back signal will be present in both Left and Right Rear Surrounds (forming a phantom rear centre). It can also be decoded as 7.1 by sending the Surround Back decode to both the Surround Back Left and Right speakers (forming two mono Back Surrounds).

DTS-ES Matrix

Known also as DTS (3/3) Matrix, an enhanced form of DTS. On top of the discretely encoded 5.1 channels DTS ES also provides an extra 6th channel (Surround Back giving 6.1), matrix encoded into the rear surrounds for greater image depth and more solid sound localisation behind the listener. DTS ES requires a DTS ES encoded disc. DTS ES material is backwards compatible with DTS 5.1 decoding. If DTS ES is decoded as normal DTS the Surround Back signal will be present in both Left and Right Rear Surrounds (forming a phantom rear centre). It can also be decoded as 7.1 by sending the Surround Back decode to the both the Surround Back Left and Right speakers (forming two mono Back Surrounds).

DTS-ES Discrete

Another enhanced form of DTS, also known as DTS (3/3) Discrete or DTS ES Discrete 6.1. DTS ES Discrete also provides an extra channel (Surround Back) for greater image depth and more solid sound localisation behind the listener, however in this case extra data is included in the bitstream so that all channels are discretely encoded. The Surround Back has greater separation from the other channels than is possible with matrix encoded technologies. DTS-ES Discrete requires a DTS-ES Discrete encoded disc.

DTS ES Discrete is backwards compatible with both DTS 5.1 and DTS ES Matrix 6.1 decoding. If DTS ES Discrete is decoded as normal DTS the Surround Back signal will be present in both Left and Right Rear Surrounds (forming a phantom rear centre). If DTS ES Discrete is decoded with DTS ES Matrix the Surround Back signal will be decoded separately (i.e. as 6.1) but by a matrix process, which will give the same channel separation as if the source disc were actually DTS ES Matrix (but not as good as DTS EX Discrete).

It can also be decoded as 7.1 by sending the Surround Back decode to both the Surround Back Left and Right speakers (forming two mono Back Surrounds).

Pro Logic II

The replacement for original ProLogic, Pro Logic II is a technology where 5 channels (Front Left, Front Right, Centre, Surround Left, Surround Right) are encoded into a Stereo mix by an analogue matrix process. Dolby Pro Logic II material can be played back by normal Stereo equipment (as Stereo) or decoded into 5 channel surround-sound.

Dolby Pro Logic II is compatible with the earlier 4 channel (Left, Centre, Right and mono Surround) Dolby Pro Logic system (which was the decoding counterpart to Dolby Surround encoding) as used widely on Video tapes, TV broadcasts and earlier films.

Note: Pro Logic does not include a Low Frequency Effects channel for the Subwoofer, but the 650R can create a Subwoofer output (for 5.1) via Bass management. Refer to the ‘Tone/Sub/LFE configuration’ section in the ‘Operating instructions’ part of this manual.

Pro Logic IIx

A newer version of Dolby Pro Logic II which is able to recreate 6 or 7 discrete surround sound channels (with fully stereo Back Surrounds in 7 channel mode) from suitable encoded stereo source material. Pro Logic IIx also has modes for post processing either Stereo material or 5.1 material into 6 or 7 channels whether or not it has been Pro Logic IIx encoded. When 5.1 decoding is required, Dolby Prologic II decoding will always be used by the 650R in place of Pro Logic IIx as IIx only works for 6 or 7 channel output.

Note: Pro Logic IIx does not include a Low Frequency Effects channel for the Subwoofer, but the 650R can create a Subwoofer output (for 6.1/7.1) via Bass management. Refer to the ‘Tone/Sub/LFE configuration’ section in the ‘Operating instructions’ part of this manual.

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DTS Neo:6

A DTS technology which is able to recreate 6 channel (Left Front, Right Front, Centre, Left Surround, Right Surround, Surround Back ) surround sound from suitable analogue matrix encoded stereo source material. DTS Neo:6 material can be played back by normal Stereo equipment (as Stereo) or decoded into 6 channel surround-sound.

Note: Neo:6 does not include a Low Frequency Effects channel for the Subwoofer, but the 650R can create a Subwoofer output via Bass management. Refer to the ‘Tone/Sub/LFE configuration’ section in the ‘Operating instructions’ part of this manual.

DTS Neo:6 can also be decoded as 7.1 by sending the Surround Back decode to the both the Surround Back Left and Right speakers (forming two mono Back Surrounds).

DTS 96/24

A DTS technology that provides 5.1 channels of 96kHz / 24bit audio (along with video if required) on DVD-Video and DVD-Audio (video zone) discs (when suitably encoded in DTS 96/24). DVD players which allow 'DTS digital out' pass the DTS 96/24 bitstream over S/PDIF for decoding in the 650R.

DSP modes

These modes allow a surround-sound experience from source material that has no encoding at all. The surround sound effect is achieved by Digital Signal Processing of the Analogue or Digital stereo source used. Five modes are possible: Movie, Music, Room, Theatre and Hall.

Stereo/Stereo + Sub

Only the Front Left and Front Right speakers (and subwoofer if selected) have output in this mode. If an analogue source is selected it will be converted to digital via 24 bit A/D converters to allow digital domain sub creation and bass/treble controls.

If a digital source is selected the 650R will be processing either LPCM stereo (from the digital outputs of a CD player for instance) or a Stereo downmix of DD or DTS material (from the digital output of a DVD player for instance).

Other modes

Analogue Stereo Direct

Selects the analogue inputs for the current source directly with no A/D conversion, DSP processing, Bass/Treble or subwoofer channel active. Provides the very best fidelity for analogue Hi-Fi source equipment. In this mode the 650R is acting just like a normal Hi-Fi integrated amplifier.

Multi Channel PCM

Some playback devices (in particular Blu-ray players) are able to decode some of the above formats themselves internally and then output the decoded audio as Multi Channel PCM to the 650R. In addition Blu-ray disks can support native unencoded Multi Channel PCM soundtracks (of up to 8 channels) on the disc itself. In either case if your player can output these over HDMI the 650R is able to receive them in Multi-Channel PCM mode.

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Cambridge Audio 650R user manual DSP modes, Stereo/Stereo + Sub, Other modes Analogue Stereo Direct, Multi Channel PCM
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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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