Sony STR-AZ7000ES Startup Manual page 421

Help Guide
Multi Channel AV Receiver
STR-AZ7000ES/STR-AZ5000ES/STR-AZ3000ES
The sound is output from both the receiver and the TV.
Mute the sound of the receiver or the TV.
If the HDMI audio signal from the connected playback device is output from both the speakers connected to the receiver and the TV speakers, Set [Audio Out] to [AMP] in the
[HDMI Settings] menu or change the speaker output setting to "Audio System" on the TV. The sound output will only come from the speakers connected to the receiver.
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