Acer Veriton 6900Pro - Manual (Page 58)

3 Setting up your computer 46
• Earphones, headphones: Connect to the headphone jack located on
the front panel of your computer.
Note: To adjust the headphone volume, use the volume control
buttons on the keyboard. You can also adjust the volume by using
the volume icon on the taskbar at the bottom of your screen.
• External speakers: Connect to the audio-out/line-out jack (lime-green
jack) located on the rear panel of your computer.