840C Upsampling compact disc player

Digital out word width

The digital output word width can be set to 16, 20 or 24 bit (note this is different to the main audio output word width which is fixed at 24 bit for best sound quality):

Press Select to switch between the word width options.

Digital out dither

Dithering is a process where pseudo random noise is added to a signal to remove quantization effects that cause harmonic distortion and replace them with a slightly increased noise floor. The process can improve the perceived quality of digitised audio signals as a small decrease in signal to noise ration (especially where the noise is random) is much preferably to harmonic distortion to the human ear.

The 840C is able to add what is called Triangular Probability Density Function dither to the upsampled Digital Output signals. Normally, dither will have already been added to any CD or source material during its mastering process so the default for this option is off. However if a source with no dither is used (perhaps an off board A/D converter etc) TPDF dither can be turned on:

Press Select to switch between Dither On and Dither Off.

Changing input names / source naming

The 2 digital inputs can be renamed to reflect the actual source units you have connected to the 840C. Press the Menu button to scroll to either the Digital Input 1 or Digital Input 2 naming menus:

Press Select to start changing the name of the input. The first editable character will begin to flash. Use the Stop button to go up through the alphabet/available characters, and Play/Pause to scroll down. To accept your character selection, move to the next character by using the Skip/Scan buttons:

To save and exit, press Select. To cancel and exit, press Menu.

Software version

Displays the currently loaded software version:

Azur upsampling compact disc player 17

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Cambridge Audio 840C Digital out word width, Digital out dither, Changing input names / source naming, Software version
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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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