Sony STR-AZ7000ES Help Manual page 326

Help Guide
Multi Channel AV Receiver
STR-AZ7000ES/STR-AZ5000ES/STR-AZ3000ES
The surround effect cannot be obtained.
Be sure to select the optimal sound field for the content. For details on the sound fields, see
To activate the virtualizer and obtain the surround effect when the speaker pattern is set to [2.0] or [2.1], set [Sound Field] to [A.F.D.], [A.F.D. Movie], [Dolby Mode] or [DTS:X
Mode], set [Upmixer] to [Auto], and set [Virtualizer] to other than [Off].
"Selectable sound fields and their
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effects."