Yamaha RX-V3085 Owner's Manual page 24

5.1 system
X
You can enjoy surround sound even without the center speaker (4.1 system).
5.1 system (front 5.1-channel) (using surround speakers)
We recommend using this speaker system when you cannot place speakers in the rear side of
the room.
9
X
When placing surround speakers in the front side, set "Layout (Surround)" in the "Setup" menu to "Front" before
performing YPAO (p.53).
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