The Pass Labs 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 Pass Labs 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.


Technical specifications

  • Gain (dB): 8 dB;
  • Power Consumption (W): 23;
  • 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: 50K Ohm;
  • Output Impedance: < 2 ohms.


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