Things You'll Need
Instructions
Turn on your PSP and press the volume control buttons below the screen. Increase the volume to your desired level.
Press the "Menu" button, select the "Settings" option and choose "Sound Settings."
Select "AVLS" (Automatic Volume Limiter System) and turn the feature off. This will increase the volume of your PSP.
Plug your PSP into a set of speakers or use larger headphones to increase the volume.