Microtek CX4 User Manual page 22

Connection of an audio cable from a video audio source
1. Shut off the projector and video source if they are on.
2. Connect one end of the RCA Cable (Audio) to the Audio In jacks on the
projector. Insert the white plug into the L Audio In jack and the red plug into
the R Audio In jack.
3. Connect the other end of the RCA Cable (Audio) to the Audio Output jacks
on the video audio source. Connect the white plug to the left channel and the
red plug to the right channel.
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