I have the XA25 for about three months now. Here’s a review that says it all about the sound:
http://theheadphonelist.com/pass-labs-xa25-vs-first-watt-f7-the-two-newest-nelson-pass-amplifiers-go...
and another:
http://www.moremusic.nl/reviews/passlabs/XA25/review-PassLabs_XA25-music-emotion.pdf
Scroll for the English version.
I’m powering a pair of Acoustic Zen Crescendo 2 speakers (90 dB). Pass suggests at least 91 dB sensitivity so I’m borderline. I find the sound robust, detailed, startlingly quick, with a warm and an unwavering presentation. The 15x20 room fully energizes well before the amp runs out of steam. When pushed, coherence suffers and it’s noticeable. At that level I’m bothering the neighbors anyway (condo). Great amp.
http://theheadphonelist.com/pass-labs-xa25-vs-first-watt-f7-the-two-newest-nelson-pass-amplifiers-go...
and another:
http://www.moremusic.nl/reviews/passlabs/XA25/review-PassLabs_XA25-music-emotion.pdf
Scroll for the English version.
I’m powering a pair of Acoustic Zen Crescendo 2 speakers (90 dB). Pass suggests at least 91 dB sensitivity so I’m borderline. I find the sound robust, detailed, startlingly quick, with a warm and an unwavering presentation. The 15x20 room fully energizes well before the amp runs out of steam. When pushed, coherence suffers and it’s noticeable. At that level I’m bothering the neighbors anyway (condo). Great amp.