Onkyo TX-SR393 Instruction Manual page 43

Contents Connections Playback Setup
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If "ZONE A+B" is selected as an audio output destination, you can select only
the "Stereo" listening mode for the main room (ZONE A) when using the 2.1ch
speaker layout. When using a speaker layout of 3.1ch or more, you can select
only the "AllCh Stereo" listening mode.
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Front Panel≫ Rear Panel≫ Remote≫