Setting a volume limit on Sonos products
You can use the Sonos app to limit the maximum volume for each one of your Sonos products. The limit can be set on a volume scale from 0 - 100.
Sonos app for iOS or Android
- Go to the Settings menu
 - Under My System, select the Sonos product you’d like to modify.
 - Under Sound, select Volume Limit.
 - Use the slider to set the maximum volume.
 
Sonos S1 Controller app for iOS or Android
- From the Settings tab, select System.
 - Select the name of the room you’d like to modify.
 - Under Sound, select Volume Limit.
 - Use the slider to set the maximum volume.
 
Note that the Now Playing screen will still show a full volume slider but will adjust to the limit you set. If you set a product's max volume to 50%, sliding the volume bar all the way to the right will output a volume of 50% instead of 100%.
Any volume limit you set will apply to line-in autoplay as well as any alarms you’ve set.