Schiit Lyr Hybrid Headphone Amplifier Headphone Impedance: 8-600 ohms Frequency Response: 2Hz-200KHz, -3dB Maximum Output: 40V P-P into 32 ohms (6 watts RMS) THD: Less than 0.1%, 20Hz-20KHz, at 1V Size: 9 x 6.75 x 3.25