Samsung PS43D450A2W E-Manual page 175

When the receiver (i.e Home Theatre) is set to On, you can hear sound
N
output from the TV's Optical jack. When the TV is displaying a DTV (aerial)
signal, the TV will send out 5.1 channel sound to the receiver. When the
source is a digital component such as a DVD and is connected to the TV via
HDMI, only 2 channel sound will be heard from the receiver.
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