Rotating machinery is one of the most frequent causes of vibration. AVRS (Auto Vibration Reducing System) can successfully reduce vibration and noise induced by unbalanced mass during rotations. Active ball-balancing is a method employed to adjust the state of the rotor and compensate changes that might have occurred. Balls run freely at the transient state and will automatically move to the opposite position when mass becomes unbalanced. AVRS effectively reduces the vibration caused by the unbalanced disc and most importantly enhances readability and playability.