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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 |