Yes the difference is small, but the best amplifier is the one that makes the music you like to listen to sound the best in your system. Many people love how the the Brystons sound, many do not. What do you listen to: the measurements or the music? That's not a rhetorical question. There are many audiophiles who have very little interest in music and are in love with the technology and measurements and vice-versa, just the way there are Moslems and Christians. I was raised in a Quad household. Then I fell under the evil influence of the satanic Blue Circle cult.