The sound from the speaker is distorted.
Adjust the playback volume.
Make sure the tablet is sufficiently charged.
If the sound effects are turned off, the sound might improve.
Tap [
Apps & Widgets] - [
Settings] - [Sound] - [Sound enhancements] - [Settings] - [xLOUD(TM)] or
[Clear Phase(TM)] to remove the check mark from the box for that setting.