If you have one AirPods playing quieter than the other, checking your accessibility settings may help. Perhaps one earphone plays quieter due to one option. 1. Open the Settings app. 2. Select the General > Accessibility section. 3. In the Hearing section, tap «Audio/Visual.» 4. Scroll down to the volume balance slider between the left and right earbuds. Make sure the slider is exactly in the middle.