Yamaha DSP-A970 Operation Manual page 18

CONNECTING THE EFFECT SPEAKERS TO THIS
UNIT
Connect the FRONT effect speakers to the FRONT effect
speaker output terminals of this unit.
If the FRONT effect speakers are not used, the FRONT MIX
switch should be set to "ON".
Connect the REAR effect speakers to the REAR effect speaker
output terminals of this unit.
NOTE: The speaker connections above are fine for most
applications. If for some reason, however, you wish to use an external
power amp for any or all of the effect channels, connect the line level
output jack(s) for each channel to the INPUT jacks of the external
amp and connect the corresponding speaker pair to the speaker
terminals of the external amp.
NOTE: If the pin plug is inserted in the FRONT/REAR EFFECT out
jacks, the speaker output from the built-in amplifier will be cut off.
16
Front effect
speaker
This unit
Rear effect
speaker
Front effect
speaker
Rear effect
speaker