Samsung UN46ES7500F E-Manual page 550

the source is a digital component
such as a DVD player and it is
connected to the TV via HDMI, you
will hear only 2 channel sound from
the receiver.
Using the ARC function
You can listen to sound through a
receiver connected using an HDMI cable
without connecting a separate optical
cable. To listen to sound through a
receiver using the ARC function, go to