HPA4 - Class A Recommended Headphone Amplifier - Stereophile

HPA4 - Receives Stereophile's "Class A" Rating for Headphone Amplifiers

"The HPA4 adds a THX888 amplification stage to Benchmark's LA4 line preamplifier  to allow it to drive even low-impedance headphones with aplomb."

"It keeps the LA4's balanced and single-ended preamplifier outputs and adds a headphone output on a 4-pin XLR jack and a single-ended headphone output on a 1/4" jack."

- Stereophile, 2023

"The HPA4 showed each instrument in dramatic bas-relief. It accomplished this by presenting cleaner, better-articulated bass and manufacturing a sharper midrange focus than I had experienced previously with either my solid state reference, the Pass Labs HPA-1, or the tubed Linear Tube Audio Z10e." - Herb Reichert

"The LA4 preamplifier was the widest-bandwidth, widest-dynamic-range, lowest-noise, lowest-distortion preamplifier I had encountered at that time. . . . To those virtues, the HPA4 adds equally superb balanced and single-ended headphone outputs." - John Atkinson

Stereophile Fall 2023 Class A Recommended Headphone Amplifier

Stereophile Spring 2023 Class A Recommended Headphone Amplifier

Benchmark HPA4 Review in Stereophile