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Azur 851C Upsampling DAC, CD Player and Digital Pre-amplifier Features

Digital to Analogue Converter featuring S/PDIF and Toslink digital inputs, AES/EBU balanced digital input and USB audio inputs (all 24 bit compatible)
CD playback
Optional digital volume and channel balance control
Balanced XLR and unbalanced RCA analogue audio outputs
USB Audio input allowing streaming of up to 24-bit/192kHz audio from computer
ATF2™ audio up-sampling to 24-bit/384kHz
Twin Analog Devices AD1955 24 bit DACs delivering superior sound-staging and stereo imaging
Selectable digital filters – linear phase, minimum phase, steep
Audiophile grade toroidal transformer delivering ultra-low low noise and distortion
Full metal casework design with thick brushed aluminium front panel and dual layer damped feet, giving enhanced resonance control
RS232 controllable
Eco-friendly <0.5W Standby power consumption
Azur Navigator remote control with Cambridge Audio amplifier and iPod dock control
Available in black and silver finishes


ATF2™ Upsampling allows digital audio signals from virtually any audio source to be upsampled, resynchronised and retimed for extraordinary levels of detail. In effect, upsampling the digital data stream (up to 384kHz) allows existing “standard” CDs to have the enhanced audio clarity, richness and dynamic range that would normally be associated with SACD or DVD-A disks “upgrading” the investment you have already made in your CDs. You’ll be astonished once you hear what you have been missing!

Three proprietary technologies are included in ATF2 effectively reduce noise artefacts caused by imperfect digital systems and allow the digital signal to closer represent the true analogue sound of the studio mastered audio data. Furthermore, by leveraging powerful DSP architectures, ATF2™ allows discerning music lovers to benefit from truly sublime high-end performance for a much lower financial outlay than ever before.

Jitter Suppression allows any incoming audio stream to be resynchronised and retimed to a local very high quality clock. By using a stable -reference oscillator , the negative effects of inter-component jitter can be dramatically reduced. When converting the digital audio to an analogue signal through high performance D/A converters, this reduction in jitter has enormous benefits in the level of detail and clarity in the reconstructed analogue sound. 
Combining this process with a time domain model using an advanced cubic interpolation algorithm, our unique ATF2 systems upsamples all incoming audio to 24 bits at 384kHz whilst applying noise shaped dither and is able to actually increase the linearity of response of the D/A converters. 
The end result is tighter, more focused bass, increased stereo imaging, focus and separation for all musical instruments and voices.

ATF2™ Upsampling also features a selectable digital filter with three settings to suit listener preferences and their particular system set-up: 

• The Steep roll-off filter exhibits strong attenuation of aliasing images outside the pass band (i.e. above 22.05kHz) at the expense of a little pre and post-ringing in the time domain. 

• The Linear phase filter uniquely features ‘constant group delay’ which delays all audio signals at all frequencies by the same amount meaning all audio is fully time-coherent at the output.

• Minimum phase meanwhile does not feature constant group delay but rather the co-efficients have been optimised without feed-forward so that the impulse response exhibits no pre-ringing in the time domain.