Sony STR-ZA810ES Manual page 165

When you select [AMP], audio signals are not output from the speaker of the TV.
When you select [TV + AMP], the sound quality of the playback device depends on the sound quality
of the TV (number of channels, sampling frequency, etc.). If the TV has stereo speakers, the sound
output from the receiver is in the same stereo as the TV, even when playing back multi-channel
source.
When you connect the receiver to a video device (projector, etc.), sound may not be output from the
receiver. In this case, select [AMP].
When you select [TV + AMP], only sound from the HDMI IN jacks is output from the speaker of the
TV.
[186] Adjusting Settings
Setting the level of the subwoofer (Subwoofer Level)
You can set the level of the subwoofer to 0 dB or +10 dB when PCM signals are input via an
HDMI connection. The level for each input to which an HDMI input jack is assigned can be set
independently.
Select [Setup] - [HDMI Settings] from the home menu.
1
Select [Subwoofer Level].
2
Select the setting you want.
3
Auto: Automatically sets the level to 0 dB or +10 dB, depending on the audio stream.
+10 dB
0 dB
Note
This setting is invalid when [FM TUNER], [USB], [Bluetooth], [Home Network] or [Music Service List]
is selected.
[187] Adjusting Settings
Selecting the method to use the HDMI OUT B jack
(HDMI Out B Mode)
The HDMI OUT B/HDMI ZONE jack can be used for HDMI zone.
Select [Setup] - [HDMI Settings] from the home menu.
1
HDMI Settings
HDMI Settings