Now and then, I joke that I am happy my linestage has a volume control (an attenuator), as an actual rock band playing in my medium-sized listening would be sonically overwhelming. Even when listening at a low volume, I was blown away by the UNO SD's reproduction of bass frequencies. Not only did the bass reach sub-sonic levels, but the low frequencies sounded nearly perfect, with a very tight midbass, a mighty sounding deep bass, with a transient response that added to the speakers' realistic portrayal of low-frequency sounds.