Samsung LED 7450 E-Manual page 23

ARC (Audio Return Channel)
For the LED 7450/7500, 8000 and PDP 8000 series models
This TV supports 3D and ARC (Audio Return Channel) functions via an HDMI cable. ARC enables
digital sound to be output using just an HDMI cable. However, ARC is only available through the HDMI
(ARC) port and only when the TV is connected to an ARC-enabled AV receiver. Connect the HDMI
cable to the TV's HDMI (ARC) connector and the device's HDMI output connector.
Certain functions such as the Smart Hub may not be avai abe if 3D Auto View is set to On whie Source is
in HDMI mode, In this case, set 3D Auto View or 3D Mode to Of£
The displayed image may differ depending on the model.