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
or a Computer port, connect the
projector to the video source using an optional stereo mini-jack
audio cable.
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.