Headphone Amp - Puristic Class-A Headphone Amplifier, four independent sub-circuits, balanced/single-ended headphones output, balanced design with 4 amplifiers, gain setting (0-12-20dB), frequency response: 20-200.000Hz (± 0.3dB), signal-to-noise ratio: >125/177dB (sym/unsym 300 Ohms), crosstalk <112dB, THD+n <0.00013/0.00014%, TYP CCIF IMD <0.00057/0.00036%, output power 1700/1000mW @ 32RZ, power supply: 2x12V/0.8A