聲線

声线
shēngxiàn
  1. voice (as sth that may be described as husky 沙啞 shāyǎ or deep 低沉 dīchén etc)
  2. (physics) sound ray

CEDICT

physics

Entry Composition

1 聲 shēng
  1. sound
  2. voice
  3. tone
  4. noise
  5. reputation
  6. classifier for sounds
2 線 xiàn
  1. thread
  2. string
  3. wire
  4. line
  5. (after a number) tier (unofficial ranking of a Chinese city)

classifiers: 條, 股, 根