You are actually the second person to ask me that this week, which is odd because this is a question which I am normally asked in connection with speakers rather than amplifiers. The H120 manages just fine at low volume. Hegel amps are known for their low noise and low distortion so they tend to sound clean across a range of output levels. I would say though that most amps and loudspeakers scale their output in a linear fashion, within their defined limits. They do not take into account changes in perceived loudness of specific frequencies at different volume levels. If you find a particular speaker or amplifier dissatisfying at low level then it may be an artefact of human hearing rather than something that the equipment is doing wrong. You can compensate for this by toeing in your speakers less or by moving them closer to the wall (or both). When you set up your speakers, optimise them according to whatever volume level matters most to you, typically the level you use most often.