Entering their 22nd year of production, the X and XA power amplifiers have remained at the cutting edge of audio through continuous innovation and refinement. At Pass we build amplifiers with excessive output stages, huge heat sinks and massive power supplies. We use the highest quality components in simple linear topologies, assembled and tested with great care in Auburn, California. They measure well and sound great. They are heavy, reliable and expensive.

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Technical specifications  

20 dB gain
Output Power
25 Watts rms @ 8 ohms 50 Watts rms @ 4 ohms
0.1% @ 25 Watts, 8 ohms, 1 KHz
Class A envelope
50 Watt peak for 2, 4 or 8 ohm load
DC to -2 dB @ 100 KHz
Less than 50 uV output, unweighted 20 to 20 KHz
Damping Factor
Slew rate
100 V/uS
Input Impedance
47 Kohm
Peak Current
10 Amp output (200 Watt peak into 2 ohms)
Shutdown at 10 amps output
Idle Power draw
2.0 Amps @ 120 VAC (240 Watts)

Awards and Reviews  

"As I listened to album after album, I could hear the textures, colors, tones, and harmonics of music in a way that was very moving. The system’s timbre realism with individual instruments and voices was as satisfying with the XA25 as it had been with any amp. All of this added up to enable my system to play music with a wonderful lifelike flow." Jack Roberts


Recommended Components - 2018


"Its divine transparency blesses and illuminates every aspect of the music it touches, enhancing the subtlest aspects of tone, texture, microdynamics, space, and atmosphere."

Stereophile / Herb Reichert

"I thought I would never hear a solid-state amplifier that could create the gorgeous timbres/tonality/color of the finest tube-based amplifiers, yet that's what you get with the XA25"

hometheaterreview.com / Terry London

"With my audiophile ears standing at full attention I noted that each instrument sounds like it's in its own "space" on my favorite recordings."

CNET / Steve Guttenberg

Occasional 2018 Buyers Guide

Part-Time Audiophile

Best of 2018 Award


Recommended Components - 2019


The Absolute Sound's 2020 Buyers guide

The Absolute Sound

"I was quite excited when I received notice from Positive Feedback Editor Doc David that there was a Pass Labs XA25 Class A stereo amplifier available for me to write about for Positive Feedback."

Positive Feedback / Jeff Day


Owner's Manual

CAD file

Spec sheet