Sony STR-DA5200ES Operating Instructions Manual page 59

Types of 2CH mode
x 2ch Stereo
The receiver outputs the sound from the front
left/right speakers only. There is no sound
from the sub woofer.
Standard 2 channel stereo sources completely
bypass the sound field processing and multi-
channel surround formats are downmixed to 2
channel.
Note
No sound is output from the sub woofer in the 2CH
STEREO mode. To listen to 2 channel stereo sources
using the front left/right speakers and a sub woofer,
select "A.F.D. AUTO."
This receiver will generate a low frequency signal
for output to the sub woofer when there is no L.F.E.
signal, which is a low-pass sound effect output from
a sub woofer to a 2 channel signal.
x 2ch Analog Direct
You can switch the audio of the selected input
to 2 channel analog input. This function
enables you to enjoy high quality analog
sources.
When using this function, only the volume and
front speaker balance can be adjusted.
59 GB