Pass Labs HPA-1 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.

SPECIFICATIONS

Gain (dB)  8 db
Frequency Response 10hz – 100k  -1 dB
Output Power into 20 ohms  3500 mW
THD + Noise  < 0.005 at 1V out
Out Power into 300 ohms  200 mW
Input Impedance 50K  Ohm
Output Impedance  < 2 ohms
Power Consumption (Watts)  23
Dimension (W x D x H) (In.)  11 x 13.5 x 4
Unit Weight (LBS)  14