Sony STR-AN1000 Help Manual page 247

Help Guide
Multi Channel AV Receiver/Multi Channel AV Amplifier
STR-AN1000/TA-AN1000
Upmixing the 2-channel sound source (Upmixer)
You can perform a pseudo upmix of a 2-channel sound source according to your surround environment.
Select [Setup] - [Audio Settings] from the home menu.
1
Select [Upmixer].
2
Select the setting you want.
3
Auto: Upmix is performed according to the surround environment.
Off
Note
This function does not work in the following cases:
[Bluetooth Mode] is set to [Transmitter].
The sound field is set to [2ch Stereo], [Direct] or [Headphone (2ch)].
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