Sony STR-AZ7000ES Help Manual page 321

Help Guide
Multi Channel AV Receiver
STR-AZ7000ES/STR-AZ5000ES/STR-AZ3000ES
No sound is heard from the active subwoofer or the center speaker.
Sound may not be output from the target speakers depending on the playback signals or the speaker settings.
Be sure to select the optimal sound field for the content. For details on relations between sound fields and speaker outputs, see
outputs."
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"Relations between sound fields and speaker