Sony STR-ZA810ES Manual page 153

Type B: This function adjusts each speaker's distance and angle to simulate the sound
of an ideally placed surround system. When surround speakers are available, the 4
surround speakers sound as if they have been placed at the identical angle.
When height speakers such as front high speakers or top middle speakers are
available, the height speakers sound as if they have been placed on each side directly
aligned with the front speakers.
Off: Speaker positioning is not relocated.
Note
This function does not work in the following cases.
[Direct] is being used and an analog input is selected.
There are no surround back speakers and [Surround Speaker Position] is set to [Front].
When [In-Ceiling Speaker Mode] is set to [Front & Center] or [Front].
[DSD Native] is set to [On] and DSD signals are being played back.
Perform Auto Calibration before using the Speaker Relocation/Phantom Surround Back function.
[168] Adjusting Settings
Setting the height from the floor to the ceiling (Ceiling
Height)
Set the height from the floor to the ceiling. You can make the [In-Ceiling Speaker Mode] function
and Dolby Atmos enabled speakers work better by configuring this setting and performing Auto
Calibration.
Select [Setup] - [Speaker Settings] from the home menu.
1
Select [Ceiling Height].
2
Adjust the height.
3
Speaker Settings