timbre       
noun [ U ]  music specialized uk/ˈtæm.bər/ us/ˈtæm.bɚ/
 音质,音品,音色
a quality of sound that makes voices or musical instruments sound different from each other
  He has a wonderful singing voice, with a rich timbre and resonant tone. 他的歌声真好听——音色饱满,声音洪亮。 
 Synonyms: quality tone