Epson EMP-713 Owner's Manual page 32

Connecting the Audio Cable
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1. Connect one end of the projector's U SB mouse cable to
the U SB Mouse port on the projector
2. D isconnect your Macintosh's mouse cable. Connect the
other end of the projector's U SB mouse cable to the
mouse port on your Macintosh.
1. If you will be using audio, connect one end of the audio
cable to the Audio In jack on the projector.
Audio In jack
2. Connect the other end of the audio cable to the Audio
O ut port on your computer.
http://www.usersmanualguide.com/
audio cable