It is a terrific and awesome ampifier, ST-10m are a statement to what Class D well done can deliver, very quick, controlled, detailed, open, inner details revealing, I really loved them, as many have mentioned also very silent, a quite dark background, and these comments considering I have as reference a very well known and awarded pair of mono amplifiers from other manufacturer. Anybody looking for great mono amplifiers should listen to a pair of ST-10m.