Wyred 4 Sound mPRE (SILVER) - Premium Audiophile Stereo Preamplifier with Built-in DAC and Headphone Amplifier Fully balanced, Dual mono design Built-in ESS DAC which supports 24 bit 192 kHz on all digital inputs Built-in Headphone amplifier Home Theater Bypass and Remote Control 100k input impedance, 1 set of XLR inputs and outputs, 2 sets of RCA inputs and outputs