Yamaha DSP -A780 - Manual (Page 9)

Speakers and Speaker Placement
Your full five-speaker system will require two speaker pairs: the
MAIN SPEAKERS (your normal stereo speakers) and the REAR
EFFECT SPEAKERS, plus the CENTER SPEAKER. You may also
be using a subwoofer.
You will probably use your present stereo speakers as the MAIN
SPEAKER pair. The rear effect do not need to be equal with the
MAIN SPEAKERS, although the center speaker should be as close
as possible. They should have enough power handling capacity to
accept the maximum output of the DSP system.
Place the MAIN SPEAKERS in the normal position.
Place the REAR EFFECT SPEAKERS behind your listening
position. They should be nearly six feet up from the floor.
Place the CENTER SPEAKER precisely between the two MAIN
SPEAKERS. (To avoid interference, keep the speaker above or
below the television monitor, or use a magnetically shielded speaker.)
If using a SUBWOOFER, such as a Yamaha Active Servo
Subwoofer System, the position of the speaker is not so critical
because low bass tones are not highly directional.
NOTE: The Yamaha NS-C110 speaker, available in some countries,
is an ideal choice for the center speaker.
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Main speaker Rear effect speaker Center speaker