If there is no speaker icon in the menu bar, click on the Apple menu and select “System Preferences.”
Click on “Sound,” then click on the “Output” tab.
Place a checkmark next to “Show volume in menu bar.” The speaker icon is now displayed in the menu bar.
 Your volume output is now increased.Alternately press the “up volume” key on your keyboard to adjust volume. On most Mac OS X keyboards, this key is labeled F12.
Click on the speaker icon displayed in the menu bar.
Drag the slider button upward to increase the volume as desired.
{"src": "wikihow-all_validation", "title": "How to Increase Your Volume on a Computer4"}