Use preset equalizers to enhance your phone’s speaker sound, or apply sound profiles to your headphones or other connected device based on the type of media playing.
You can select a preset sound profile for your loudspeaker, headphones, or other connected device, and your phone will remember the next time you connect it.
Open quick settings, then touch & hold 

Choose how to adjust sound:
To customize a selected sound profile, next to the profile name tap 


Dolby Atmos is always on when you’re using your phone’s speaker.
To turn it off entirely when you're using headphones or other connected devices:
