“…their phenomenally lit-up quasi holographic sound staging, and the attendant hear-a-pin-drop perception that nothing whatsoever remained obscured in any remaining noise floor. The low bass was just as adroit and illuminated. Absence of all darkness simply bled out from the lower registers any sense of that extra weight, emphasis and/or striated wiriness which much class D injects. Rather than play chief attraction for any otherness, from conventional amplifier topologies… AGD Vivace low bass fell in line behind the mid and treble bands. It was always present to play its immaculately detailed supporting role but never stepped out for a selfie. This supplementary inclusion of the bottom registers added itself to the overriding sense of speed and shadow-less clarity to describe the sound’s sum total…”