The ViewSonic X2 projector is equipped with speakers, however, you can also connect external speakers to the AUDIO OUT port of the projector.
The connection illustrations below are for reference only. The connecting jacks available on the projector vary with each projector model. Some cables may not be included with the projector. They are commercially available from electronics stores.
NOTE:
• The audio output is controlled by the remote control and the projector’s Volume and Mute settings.
• The AUDIO IN port only works when the input signal is in the DVI-D format.
Read more:
ViewSonic X1 Computer Connection Guide
How to Set up Key Lock on ViewSonic X1 Projector