Pass Labs HPA-1c Headphone Amplifier

The HPA-1 headphone amplifier was designed ground-up to become what we believe is one of the very best sounding headphone amplifiers available today. With low feedback, wide bandwidth and a direct coupled MOSFET output stage, this musical instrument drives even the most difficult headphone loads with ease, power, and grace. The HPA-1 also functions as a line-level preamplifier that sonically rivals much higher-priced competition. The measured performance is superb and the sound even better. Gain 8 dB Power Consumption 23 W Output Power into 20 ohms 3500 mW Output Power into 300 ohms 200 mW Frequency Response 10hz -100k -1 dB THD + Noise <0.005 at 1V out Input Impedance 50 kOhms Output Impedance < 2 ohms