Cambridge Audio user manual 840C Upsampling compact disc player, Introduction

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840C Upsampling compact disc player

INTRODUCTION

Thank you for purchasing this Azur 840C Upsampling Compact Disc Player. This unit is part of our new '8' series range, taking Cambridge Audio to new levels of audio excellence. The 8 series range has been developed as part of our commitment to the on-going development of the Azur range. We hope that you will appreciate the results and enjoy many years of listening pleasure from it.

The 840C incorporates a raft of new technologies and features. Key to its abilities is the ATFTM (Adaptive Time Filtering) upsampling process - developed in conjunction with Anagram Technologies of Switzerland. This system intelligently interpolates 16 bit/44.1kHz CD (or other) data to 24bit/384kHz through the use of a 32 bit Analog Devices Black Fin DSP (Digital Signal Processor) for the very best sound quality. The ATF system applies sophisticated polynomial curve fitting interpolation and incorporates a time domain model which allows data buffering and re- clocking almost completely eradicating digital jitter.

Because the audio data rate is so high aliasing artefacts are moved way above audible frequencies allowing us to use a low order 2 pole linear- phase Bessel filter on the output for constant group delay and minimal phase shift.

Two very high quality Analog Devices AD1955 24 bit DACs (Digital to Analog Converters) are used in dual differential mode. As each channel has its own DAC to process information, completely separate and symmetrical analog filter circuitry can be implemented. These allow both left and right channel circuitry to operate identically, ensuring the 840C delivers fantastic sound-staging and stereo imaging properties. All filtering from DACs to output is also fully differential using unique differential output amplifiers.

This fully balanced configuration largely rejects the already very low noise and distortion products present in the DACs and filters and provides an unprecedented level of performance.

A true balanced (XLR) output is fitted as well as a summed conventional unbalanced phono/RCA output. Automatic DC servo circuits null all DC offsets allowing no capacitors in the signal path at all.

Two digital inputs are fitted allowing other digital sources to be brought into the 840C and upsampled, the 840C then working as a very high quality DAC.

A digital output is also fitted which can even output upsampled data at various rates and word widths, independent from the main audio output, which is always set at 24/384 for best sound quality.

In addition to these audiophile features Control Bus Input/Output, IR Emitter Input and RS232 control are provided to make it easy to integrate this unit into Custom Installation systems if desired.

A completely new 8-series casework has been designed which combines massive structural rigidity with careful damping and control of acoustic resonance. An Azur Navigator remote control is also provided, giving full remote control of your CD player and Azur amplifiers in an attractive and easy to use handset.

Your CD player can only be as good as the system it is connected to. Please do not compromise on your amplifier, speakers or cabling. Naturally we particularly recommend amplification from the Cambridge Audio Azur range, and in particular the 840A Integrated Amplifier which has been designed to the same exacting standards as this CD player. Your dealer can also supply excellent quality Cambridge Audio interconnects to ensure your system realises its full potential.

Thanks for taking the time to read this manual; we do recommend you keep it for future reference.

Matthew Bramble, Technical Director

Azur upsampling compact disc player 3

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Contents Azur 840C Contents Introduction 840C Upsampling compact disc playerChecking the Power Supply Rating Safety PrecautionsImportant Note Important Safety InstructionsRear Panel Connections Power On/OffMains Voltage Selector Switch AC power socketUnbalanced Audio Out Control BusDigital outputs Digital Inputs 1Infrared sensor Front Panel ControlsStandby/On Select MenuStop DisplayOpen/Close Play/PauseRemote Control Remote Control of Matching Products Locating a specific track Operating InstructionsLoading and unloading discs Normal disc playPlaying tracks in a random order Using the Intro functionLocating a particular point in a track Repeating discs and tracksProgramming disc play Using the A-B functionUsing the Remain function Using the Space functionExternal Digital Sources CD playbackDigital Input 1/2 CD Player Setup Menu structureDigital out sample frequency Software version Digital out word widthDigital out dither Changing input names / source namingTroubleshooting Custom Installation C.I. USEDigital output sampling frequencies supported Technical SpecificationsLimited Warranty 840C Upsampling compact disc player Azur 840C

840C specifications

The Cambridge Audio 840C is a high-performance CD player and digital-to-analog converter (DAC) that has garnered attention from audiophiles and music lovers since its release. This player stands out for its blend of cutting-edge technology and elegant design, making it a sought-after component in many high-end audio systems.

One of the standout features of the 840C is its ability to handle a variety of digital sources. It includes inputs for USB, coaxial, and optical connections, allowing users to easily integrate it with their digital audio devices. This versatility ensures that the 840C can serve as a central hub for a modern audio setup, including direct connections to computers, tablets, and other digital sources.

At the heart of the 840C is Cambridge Audio's proprietary "ATF" (Adaptive Time Filtering) technology. This innovation upscales lower-resolution digital audio to 24-bit/192kHz, enhancing the overall sound quality and allowing listeners to experience their music in greater depth and detail. This technology, combined with a highly regarded Wolfson DAC, ensures that the 840C delivers exceptional audio performance that captures the nuance and dynamics of any musical genre.

The 840C also boasts a precision clocking system, which minimizes jitter – a common issue in digital audio that can compromise sound quality. By ensuring more accurate timing of the audio signal, the 840C creates a more coherent soundstage and improves the overall listening experience.

Another notable aspect of the 840C's design is its robust construction. Built with high-quality components and a solid chassis, this player not only minimizes internal vibration but also ensures durability. The aesthetically pleasing brushed aluminum finish adds to its appeal, allowing it to fit seamlessly into a variety of audio setups.

Audio enthusiasts will appreciate the 840C's user-friendly interface, which makes navigation through tracks, playlists, and settings straightforward. The remote control further enhances usability, offering quick access to essential functions.

In summary, the Cambridge Audio 840C is an exemplary piece of audio equipment that combines advanced technology with high-quality sound reproduction. Its versatile outputs, state-of-the-art DAC capabilities, robust design, and user-friendly operation make it an ideal choice for anyone looking to elevate their audio experience. Whether enjoying CDs or streaming high-resolution digital files, the 840C promises to satisfy even the most discerning listeners.
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