Why is my volume so low? Maybe you didn’t turn the speaker or Microphone volume up enough. Solution 1: Check Speaker or Microphone Volume Control
This sound volume problem may happen after upgrading the system to Windows 10 or using the microphone on the Skype or enjoying YouTube videos. Some people may encounter the problem that the sound coming out of speaker or headphones is too low, even if you adjust computer volume to a maximum of 100%, the sound still keeps quiet.