... Resolution FIFI Quality Sound Multifunction AUNE X1 Black Digital DAC& Headphone AMP & Preamp HIFI AMP MINI DAC X1 MIni DAC Information ... and optical 24BIT/192K ,24bit/192K music playback C,Modular headphone-amp design , OP+BUF framework D,Aluminum chassis with vertical ... audio inputs and one analog input I,Drive 32-300 ohm HIFI headphone J,One standard HIFI CD output format K,Single ...