The Xa25 actually hits over 3x the listed (25w 8 ohm) wattage with 1% THD+N... Pass rates it @ .01%. It’s a little powerhouse as this is a pure class A amp. It really kicks a$$. It has more grunt than the numbers might suggest.
https://www.stereophile.com/content/pass-laboratories-xa25-power-amplifier-measurements
https://www.stereophile.com/content/pass-laboratories-xa25-power-amplifier-measurements