Optoma HD81 User Manual page 20

Installation
20
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Option 2
Using HD81 as video source selector and directly connecting the video
source to the AV Receiver:
If you do not have an HDMI equipped AV receiver, to ensure proper audio
connections, you will need to directly connect the Audio out from the Video
source to your receiver. The HD81 will be used only to process the Video
signals.
1) Connect the video sources to the HD81's Video Box.
2) Connect the video sources audio out directly to your receiver.
3) Attach the short HDMI cable that comes standard with the unit to the "To
AV Receiver" port on the back of the HD81's Video Box. Connect the other
end to the "From AV Receiver" port on the back of the HD81's Video Box.
This will allow the video signal to be properly managed.
4) Connect an HDMI Cable to the "To Projector" on the back of the HD81's Box
side. Connect the other end to HD81's projector side.
Option 3
If you have a single HDMI source, you can hook the Video source
directly up to the "From AV Receiver" port on the back of the HD81's
Video Box. Connect a second HDMI cable to the "To Projector" port on
the back of the HD81's Video Box and attach the other end to HD81's
Projector side.
This confi guration only process high resolution video for HD81's projector.