Speaker Setup - Yamaha RX-V992 Mode D'emploi

Setting Up Your Speaker System
This unit has been designed to provide the best sound field
quality with a full five-speaker system setup, using one extra pair of
effect speakers to generate the sound field plus one center
speaker for dialog. We therefore recommend that you use a five-
speaker setup. A four-speaker system using only one pair of effect
speakers for the sound field will still provide impressive ambience
and effects, however, and may be a good way to begin with this
unit. You can always upgrade to the full five speaker system later.
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SPEAKER SETUP

Use of the Center Dialog Speaker Is Recommended
When playing back a source with the DSP programs No. 1
through No. 4, or when the Dolby Digital (AC-3) is decoded with
any DSP program used, if the source contains center-channel
signals, dialog, vocals etc. are output from the center channel.
Therefore, if you want to maximize the performance of your
Audio/Video home theater system, it is recommended that you use
a center channel speaker.
If for some reason it is not practical to use a center speaker, it
is possible to enjoy movie viewing without it. Best results, however,
are obtained with the full system.
Use of a Subwoofer Expands Your Sound Field
It is also possible to further expand your system with the
addition of a subwoofer and amplifier. The use of a subwoofer is
effective not only for reinforcing bass frequencies from any or all
channels, but also for reproducing the LFE (low frequency effect)
sound with high fidelity when playing back a source with the Dolby
Digital (AC-3) decoded. You may wish to choose the convenience
of a Yamaha Active Servo Processing Subwoofer System, which
has its own built-in power amplifier.