The threshold of hearing may vary for different people and at different times for the same person, depending on age, physiological condition, and training.
Xariiq qalooca wakhti-saamaynta ayaa ku kala duwanaan kara qof ka qof, iyo wakhtiyada kala duwan isla qof isku mid ah, iyada oo ku xiran qiyaasta, barta durista, heerkulka jirka iyo waxqabadka jirka.