What digital gain does
Digital gain multiplies the audio signal before it reaches the device output. It can make a quiet recording easier to hear when the system has unused headroom.
If the recording is already near its maximum level, extra gain can clip peaks and create harsh distortion without producing useful clarity.
Why gain is not speaker repair
A blocked grille, wet diaphragm, damaged driver or weak amplifier remains physically limited. Pushing a louder signal into that problem can make buzzing more obvious.
Use the speaker test and physical-symptom checklist before assuming the file needs more gain.
Protect hearing and hardware
Start low, raise the gain gradually and stop at the first sign of discomfort or sharp distortion. Set headphone volume before putting headphones on.
Do not use boosted playback as a continuous solution for one quiet earbud; the healthy side may receive an unsafe level.
Why local processing matters
The nBeats booster uses a file you select and processes playback in the browser. It does not need an account or a server upload.
Use it for media-level correction, not emergency wet-device recovery. For muffled water exposure, use the water-eject and drying guidance instead.