... /192K ,24bit/192K music playback C,Modular headphone-amp design , OP+BUF framework D,Aluminum chassis with vertical and horizontal display E ... ,Part of a complete set with X2 amp and X3 loudspeaker ... Multifunctional as USB DAC, USB sound Card , Headphone –amp and Pre-amp Headphone-amp 6.5mm headphone jack, it can drive 30-300ohm ...