Automatic Adjustment of Volume Dynamics and Equalization

1. Right click the speaker icon and choose Open Sound Settings from the menu which appears.

2. Next click on Sound Control Panel – over toward the upper right:

3. Click Playback, Speakers, Properties.

4. Click Enhancements, Loudness Equalization, OK.

5. That is all. Now your playbacks should all have the same loudness!

References
https://www.howtogeek.com/115656/3-ways-to-normalize-sound-volume-on-your-pc/