sound man

or sound·man

noun
  1. a technician who produces sound effects.
  2. a technician responsible for the quality of sound that is broadcast or recorded.
  3. Theater. a technician responsible for the proper placement of microphones, achieving the desired volume and balance of sound from various sources, and eliminating any distortion caused by amplification.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018