dynamic range
noun
1- the range of acceptable or possible volumes of sound occurring in the course of a piece of music or a performance（一段音乐或表演的）力度变化范围。
1.1
- the ratio of the largest to the smallest intensity of sound that can be reliably transmitted or reproduced by a particular sound system, measured in decibels（某音响系统可传递或播放的声音的）力度比, 最强音与最弱音之比。