Different methods like acoustic analysis, wear debris monitoring, and vibration analysis are used for condition monitoring of mechanical equipment such as gearbox. In gearboxes, gear defects are sources of noise and vibration. This study deals with the acoustic analysis of a gearbox to identify various gear faults. This work examines the ability of sound mapping for identifying various faults in the gearbox. Single-stage spur gearbox was used to perform the experiments. Sound intensity and sound pressure were recorded. Sound intensity and sound pressure maps were formed. Three different types of defects were introduced in the gears, which include missing tooth, profile error, and crack in root defect. In the analysis, signals from the gearbox with defects were compared with the healthy gearbox. From the study it was found that the sound maps such as sound intensity map and sound pressure map can detect defects in the gears. These outcomes indicate that the proposed acoustic techniques give a good alternative for detecting various gear defects.