Acoustic gain is defined as?

• A. The difference in dBSPL between the input to the hearing aid and the output from the hearing aid
• B. The maximum output
• C. The battery life increase
• D. The overall loudness of the device

Answer: (A)

Acoustic gain is the amount of amplification the hearing aid provides to the incoming sound, expressed as how many decibels the signal is increased from input to output. It is defined as the difference in dB SPL between what enters the device and what comes out. For example, if the input is 60 dB SPL and the output is 90 dB SPL, the gain is 30 dB. This focuses on how much the device boosts the signal, regardless of the device’s own loudness or other factors. The maximum output describes the loudest level the device can produce, not the typical amplification. Battery life and the device’s overall loudness aren’t the measure of gain.