Acute Hearing is one of Fallout GURPS advantages. See: Fallout GURPS.
You have better-than-average senses. Acute Hearing gives you a bonus to your IQ whenever you must roll to hear something, or when the GM rolls for you. Each acute sense is a separate advantage, and costs 2 points for every +1 bonus to your roll. E.g., Acute Hearing +6 costs 12 points.”— Steve Jackson Games GURPS sources
With the abandonment of GURPS, Acute Hearing was removed from the game