How many decibels must audibles be above ambient sound levels?

The requirement for audibles to be a certain number of decibels above ambient sound levels is crucial for ensuring that alarms and notifications can effectively capture attention in various environments. The standard is typically set at 15 decibels above ambient sound levels. This level differentiates audibles from background noise, ensuring that they are sufficiently loud to be heard and prompt a response, thereby enhancing safety in emergency situations.

Audibles that are only 10 decibels above ambient noise might not be effective in environments where background sounds are louder, such as in industrial settings or during heavy traffic. Similarly, while 20 or 25 decibels above ambient levels may provide a greater margin, they can also lead to unnecessary discomfort and auditory stress for individuals in the vicinity. Therefore, the 15-decibel threshold strikes a balance between audibility and comfort, making it the correct standard for effective notification systems.