Yamaha DSP-A970 - Manual (Page 10)

Speakers and Speaker Placement
Your full seven-speaker system will require three speaker pairs:
the MAIN SPEAKERS (your normal stereo speakers), the FRONT
EFFECT 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 front effect, 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 or the
external amps that will drive them.
Place the MAIN SPEAKERS in the normal position.
Place the FRONT EFFECT SPEAKERS further apart than the
MAIN SPEAKERS, on either side of and a few feet behind and above
the MAIN SPEAKER pair.
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 Effect speaker Center speaker