Increase max speaker volume in KDE 5 without installing additional software

Solution 1:

This is possible by accessing the Audio Volume widget's settings.

  • Right-click the Audio Volume widget and open settings. Audio Volume Settings
  • Open the General Tab.
  • Change max volume and volume step as per your needs.
  • That's it. Now, increasing volume through the volume keys lets you reach volume levels greater than 100%. img

Solution 2:

In newer versions of KDE Plasma (~ version 5.17), this option exists in Volume manager itself, as a checkbox at the bottom named "Raise Maximum Volume", allows volume upto 150%.

Plasma Volume Manager