The noise canceling effect is weaker after updating the unit’s software.

The Adaptive Sound Control setting may have been activated automatically after the software was update.
If the noise canceling effect seems to have become weaker, use the Sony | Headphones Connect app to check the Adaptive Sound Control and Ambient Sound Control settings.

1. Turn off the Adaptive Sound Control.
   1. Launch the Sony | Headphones Connect app, and on the Status tub, check the Adaptive Sound Control status. If the status shows other than Off (Staying, Walking, etc.), select right arrow on the right side of the Adaptive Sound Control menu.
      
   2. Turn off the Adaptive Sound Control.
      
      
2. On the Sound tab, tap the Down arrow button on the right side of the Ambient Sound Control menu, and select NOISE CANCELING.
   Note: The menu items may vary depending on the model.
   

Note: Adaptive Sound Control is a function that can detect four patterns of behavior (Staying/Walking/Running/Transport) using the acceleration sensor of your smartphone and automatically switch between Noise Canceling and Ambient Sound Control modes based on the setting for each behavior pattern. For details on Adaptive Sound Control, see the Help Guide.