You can only set [Surround Back Speaker Assign] if the speaker pattern is set to a setting that does not have surround back and
height/overhead speakers.
Related Topic
Selecting the front speakers
Speaker installation example
Installing 5.1-channel speaker system with front B speaker connection
Selecting the speaker pattern (Speaker Pattern)
Assigning the surround back speaker terminals (Surround Back Speaker Assign)
Notes on connecting cables
How to connect speaker cables
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