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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.

Announcing the new Headphone Amp from Pass Labs!

Like the XP preamplifiers, the HPA-1 is the result of great attention to detail.

Starting at the power cord, the AC line is first filtered for high frequency noise and then isolated by a special toroidal transformer shielded by mu-metal for lower magnetic noise and shielded for electrostatic noise by a separate Faraday shield, grounded to analog ground. This is followed by fast/soft recovery rectifiers, generous CRC passive filtering and sophisticated discrete DC regulators and then more passive RC filters.

Works with headphones
with impedances of 15 ohms to 600 ohms

Low feedback wide bandwidth discreet design.

Class A 
direct coupled Mosfet output stage

Custom low noise Torodial power transformer 
with a Farady shield

Discrete regulated power supply for audio circuits.

 

SPECIFICATIONS

Gain (dB)                                   8 dB
Power Consumption (W)             23
Output Power into 20 ohm          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