Pass Labs HPA-1 Headphone Amplifier / Class A Preamp – Mint / Like New

Pass Labs HPA-1 headphone amplifier / line-level preamplifier in mint, like-new condition.

This unit is absolutely immaculate and has been carefully kept in a clean home environment. Fully functional, cosmetically excellent, and presenting as new.

The HPA-1 is a high-end discrete Class A headphone amplifier designed by Pass Labs, also functioning as a serious line-level preamplifier for a minimalist reference system. It features a low-feedback, wide-bandwidth design, J-FET input stage, direct-coupled MOSFET output stage, and enough power to drive demanding dynamic and planar headphones with ease.

Key specifications include 8 dB gain, frequency response of 10 Hz–100 kHz, output power of 3.5 W into 20 ohms, 200 mW into 300 ohms, output impedance below 2 ohms, and a substantial 14 lb chassis.

Condition:
Mint / Like New
No scratches, dents, rack rash, or visible wear
Fully tested and working perfectly
Used gently in a private home setup

The HPA-1 is widely regarded not only as an exceptional headphone amplifier, but also as a very capable standalone preamp. Pass Labs describes it as a low-feedback, wide-bandwidth MOSFET design that can drive difficult headphone loads with ease, while also serving as a high-quality line-level preamplifier.