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 
Or, open the Dolby Atmos app 
Choose how to adjust sound:
To customize a selected sound profile, next to the profile name tap 


To turn Dolby Atmos off for headphones or another connected device:

To turn it off when you're listening through the loudspeaker:

