Meridian - Explorer2 USB DAC Extended-range 0-100dB volume control that allows for finer adjustments Increased DSP power Trademark apodizing filter Combination USB DAC, preamplifier, and headphone amplifier with exceptional 24-bit/192kHz resolution Asynchronous USB, a six-layer circuit board with audiophile-grade components, an auto-sensing headphone input, and 192kHz-derived analog outputs