Yamaha RX-V781 Owner's Manual page 21

7.1 system (using surround back speakers)
This speaker system creates Virtual Presence Speaker (VPS) using the front, center and
surround speakers to produce a 3-dimensional sound field, and also allows you to enjoy
extended surround sounds using the surround back speakers.
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5.1 system
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You can enjoy surround sound even without the center speaker (4.1 system).
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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.
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When placing surround speakers in the front side, set "Layout (Surround)" in the "Setup" menu to "Front" before
performing YPAO (p.44).
5.1 system (front 5.1-channel) (using front presence speakers)
We recommend using this speaker system when you cannot place speakers in the rear side of
the room.
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When using front presence speakers installed to the ceiling or when using the Dolby Enabled speakers as the
presence speakers, configure the "Layout (Front Presence)" setting in the "Setup" menu before performing YPAO
(p.44).
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