Cambridge - Azur 651C (Black) Audiophile grade toroidal transformer delivering ultra-low low noise and distortion. Twin Wolfson WM8742 DACs arranged in 2-Pole Bessel; Dual Differential Virtual Earth Balanced filter topology. Proprietary Cambridge Audio S3 servo solution All PCBs and DAC stages feature doublesided surface mount technology, eliminating wire links and giving ultra short signal paths. New selectable digital filters  linear phase, minimum phase, steep. Highly accurate master clock oscillator and carefully designed impedance-matched clock buffering schemes. Wrap-around casework design with substantially thick brushed aluminium front panel and dual layer damped feet, giving enhanced resonance control. Eco-friendly &lt;1W Standby power consumption.