Please tell us some basic information before asking for help:
Rooted or not:Not Rooted
Frequency of Occurrence: Permanent
APP Name & APP Version (If your issue relates to the app):N/A
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
1.System sounds like Screen Lock/Unlock, Charing enabled are low.(Through Speaker)
2.Headphone sound is still lil bit low as compare to pie (087 build).Also treble is high and bass lil bit low.
Note:Media sound,Ringtone sound are loud and fine.(Through Speaker)