Cambridge Audio Azur 840C

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[edit] Description

Manufacturer: Cambridge Audio

The 840C embraces a raft of proprietary technologies including ATF™ (Adaptive Time Filtering) asynchronous up-sampling technology which has been developed in conjunction with Anagram Technologies of Switzerland. This system interpolates 16-bit/44.1kHz CD data to 24-bit/384kHz data, through the use of a 32-bit Analog Devices Black Fin DSP (digital signal processor). This in turn feeds two 24-bit/384kHz DACs from the same company in dual differential formation.

Each DAC handles just one channel for excellent stereo imaging, operating fully in differential mode for exceptionally low distortion and noise.

Both unbalanced RCA and balanced XLR outputs are fitted. Two digital inputs are also provided which even allow the up-sampling and playback of other sources such as a DVD player via the Azur 840C. In addition, a recording digital output can even allow bit-for-bit data or upsampled data at 48, 96 or 192 kHz to be recorded by a suitable device.

A Control Bus In/Out, an IR emitter in connection and an RS232 port are provided for easy multi-room connectivity. The RS232 protocol enables a two-way interface with third party home automation touchscreens.

As with all Azur products, the foundation of the 840C’s excellence is a bespoke chassis. This comprises an incredibly thick 7mm front panel and extruded side panels, both fashioned from aluminium, which combines with a 2mm formed steel base plate and specially designed vibration absorbing feet. The result is an ultra rigid, low resonance, acoustically dampened platform for the electronics to sit in.

[edit] Details

[edit] Features

Adaptive Time Filtering (ATF) asynchronous up-sampling technology converting 16-bit 44.1 kHz CD data to 24-bit 384kHz
32-bit Analog Devices Black Fin DSP
Dual differential DAC configuration using high-end Analog Devices AD1955 DACs
Fully differential anti-aliasing topolopgy based on linear phase Bessel filters
DC servo circuitry with no capacitors in the signal path
Two digital inputs allowing up-sampling and playback of other sources
Digital outputs allow recording of up-sampled audio
Control Bus In/Out, IR emitter in and RS232 for easy multi-room compatibility
Extruded aluminium side panels and solid aluminium front panel plus an ultra rigid, acoustically dampened chassis
Navigator style Azur remote control which also controls Azur amplifiers
Available in silver or black

[edit] Specifications

Frequency Response: 20Hz - 20kHz +/- 0.1dB
THD @ 1Khz 0dBFs: <0.0008%
THD @ 1kHz -10dBFs: <0.0004%
THD @ 20kHz 0dBFs: <0.0007%
THD @ (19/20kHz) 0dBFs: <0.0002%
Linearity @ -90dBFs: +/-0.5dB
Stopband rejection (>24kHz): > 120dB
Signal to Noise Ratio A-wtd: > 113dB
Total correlated jitter: > 130pS
Crosstalk @ 1kHz: > -130dB
Crosstalk @ 20kHz: > -114dB
Output Impedance: < 50 ohms
Digital input word widths supported: 16 - 24 bit
Digital output word widths supported: 16, 20, 24 bit
Digital input sampling frequencies supported: 32kHz, 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, 192kHz
Digital output sampling frequencies supported: 32kHz - 192kHz pass through (including 44.1kHz for CD) 48kHz,96kHz, 192kHz upsampled
Audio output up-sampling: Fixed 24 bit, 384kHz
Dimensions (H x W x D): 115 x 430 x 360mm (4.5 x 16.9 x 14.7")
Weight: 8.5kg (18.7lbs)