Upsampling compact disc player
All pre-owned product is tested in our service department and have been passed for sale... and comes with a 90 day warranty!
In nice condition. Includes factory remote and manual. Original box and packing are NOT available, but we will pack carefully.
Full specs are last image. Circa 2016-2021
The 840C incorporates a raft of new technologies and features. Key to its abilities is the ATF (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 artifacts 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.
