1. a technician who produces sound effects.
2. a technician responsible for the quality of sound that is broadcast or recorded.
3. Theat.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. Also,sound'man".
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.