You
can play sound through the projector's speaker system if your video
source has audio output ports.
If you are
projecting video using the Video
port, connect the projector to the video source using an optional
stereo mini-jack audio cable.
Note: Make
sure the audio cable is labeled "No resistance."
Note: If you
connected your video source to the projector using an HDMI cable,
the audio signal is transferred with the video signal; you do not
need an additional cable for sound.