Sony STR-AZ7000ES Startup Manual page 457

Help Guide
Multi Channel AV Receiver
STR-AZ7000ES/STR-AZ5000ES/STR-AZ3000ES
Resetting sound fields to the default settings
Be sure to use the buttons on the receiver to perform this operation.
Hold down MUSIC and press (power) on the receiver.
1
[S.F. INITIALIZED!] appears on the display panel and all sound fields are reset to their default setting.
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