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In more detail

Twin Wolfson WM8742 DACs deliver a significant performance upgrade over the 651C's award-winning predecessor and are implemented in a dual differential configuration (each channel has its own DAC to process information). A sophisticated Two-Pole Dual Differential Double Virtual Earth Balanced Bessel filter configuration rejects virtually all noise and distortion present in the DACs and filters them to produce an unprecedented level of performance.
The new DACs also feature a selectable digital filter with three settings to suit your own listening preferences and of course your own system:

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.

Cambridge Audio's CD-only S3 Custom CD ServoTMemploys a custom designed chipset and the latest double-sided surface-mount technology for ultra short signal paths with freedom from wire links. Circuits and software have been meticulously designed and S3 dynamically adjusts focusing, tracking and output level of the laser in real-time, allowing for maximum retrieval of the digital information and jitter minimisation. This is all made possible by the implementation of a powerful ARM7 processor and complemented by a highly accurate master clock oscillator and carefully designed impedance-matched clock buffering scheme.

Meanwhile, the well-proven transport guarantees incredible rigidity and the CD drawer itself has been designed to offer a smooth, high-end feel. And to ensure simple operation, a high contrast reverse black DFSTN (Double Film Super Twisted Nematic) display offers excellent feedback of the 651C's impressive features which now include CD-text support.

As with all our Azur CD players, a high quality toroidal transformer ensures lower noise and less waveform distortion for quieter PSU operation.  


Digital to Analogue ConverterDual Wolfson Microelectronics
WM8742 24-bit/192kHz capable
Filter2-Pole Dual Differential Bessel
Double Virtual Earth Balanced
Frequency Response20Hz - 20kHz (+/-0.1dB)
THD @ 1Khz 0dBFs:<0.003%
THD @ 1kHz -10dBFs:<0.0005%
THD @ 20kHz 0dBFs:<0.002%
IMD (19/20kHz) 0dBFs<0.002%
Linearity @ -90dBFs:+/- 0.5dB
Clock deviation+/- 20ppm
Stopband rejection (>24kHz):>90dB
Signal to Noise Ratio:>-115dB
Total correlated jitter:<140pS
Crosstalk @ 1kHz:<-100dB
Crosstalk @ 20kHz:<-99dB
Output Impedance:<50ohms
Max. Power Consumption25W
Standby power consumption<1W
Dimensions (W x H x D)430 x 85 x 305mm (16.9 x 3.4 x 12.2")
Weight4.8Kg (10.6lbs)