Yamaha DSP-A970 Operation Manual page 17

CONNECTING THE MAIN SPEAKERS AND CENTER
SPEAKER(S) TO THIS UNIT
Connect the MAIN speakers to the MAIN speaker output
terminals of this unit.
Connect the CENTER speaker to the CENTER speaker output
terminals. If you will be using one CENTER speaker, connect it to
either the A or B terminals and set the CENTER speaker impedance
switch to "A or B" (bottom position). If using two CENTER speakers,
connect them to the A and B terminals, and set the switch to "A + B"
(top position). If, however, you will not be using a CENTER speaker,
be sure to set the Center Mode to "PHNTM" (phantom). (See page
25.)
Main speaker
Center speaker
Center speaker
Main speaker
Center speaker
This unit
15