Rupert Neve Designs RNHP, High-End Headphone Amplifier, Based on the headphone amplifier section of the Rupert Neve Designs 5060 Centerpiece, Three switchable inputs (XLR, RCA, mini-jack), Solid steel housing, Output impedance: 0.08 Ohm at 1KHz, Frequency response: +/- 0.2 dB from 10 to 12,0000 Hz, Power supply: 24 V via an external 6 Watt power supply unit (included in the scope of delivery), Dimensions (W x D x H): 165 x 117 x 48 mm