Some highlited points-:
The issue seemingly manifests itself in a few ways. One Galaxy S21 Ultra buyer is complaining about crackling sounds coming from the loudspeaker, while others are unhappy with the speaker either being too quiet or sounding distorted. A few Galaxy S21 Ultra owners have apparently contacted Samsung and received replacement units with speakers that work as intended.
For more information tap on the link given below-:
Source-SamMobile
