Epson PowerLite 685W 3500-Lumen WXGA Ultra-Short Throw 3LCD Projector - Manual (Page 40)

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2. Connect the other end to the projector's Video port.
Parent topic: Connecting to Video Sources
Connecting to a Video Source for Sound
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.
1. Connect the audio cable to your video source's audio-out ports.
2. Connect the other end of the cable to the projector's Audio port that corresponds to the port you are
using for video.