Pass Labs - HPA-1 Headphone Amplifier

Pass Labs



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Headphone Amplifier


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Stereophile - 2018 500 Recommended Components Stereophile - 2017 500 Recommended Components

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 (dB) - 8 dB
Power Consumption (W) - 6
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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