The ATM 300 is a joy to listen to. I have never heard a 300B SET amplifier as finely wrought in purity, intimacy, and beauty, especially vocals. The ATM 300 has one of the lowest levels of listener fatigue I have encountered. And it is so sweet and true to the music, I was loath to take it out of the system, even when I wanted to play big power music and bombastic organ spectaculars. The ATM 300 is a winner.