Yamaha DSP-A970 - Manual (Page 19)

ADDING A SUBWOOFER
You may wish to add a subwoofer to reinforce the bass
frequencies.
This unit provides a line-level subwoofer output, which contains
only the frequencies under 200 Hz from the main and center
channels. Connect the LOW PASS jack to the INPUT jack of the
subwoofer amplifier, and connect the speaker terminals of the
subwoofer amplifier to the subwoofer.
With some subwoofers, including the Yamaha Active Servo
Processing Subwoofer System, the amplifier and subwoofer are in
the same unit.
CONNECTING SPEAKER SYSTEMS
Connect the SPEAKERS terminals to your speakers with wire of
the proper gauge, cut as short as possible. If the connections are
faulty, no sound will be heard from the speakers. Make sure that the
polarity of the speaker wires is correct, that is, + and – markings are
observed. If these wires are reversed, the sound will be unnatural
and will lack bass. Do not let the bare speaker wires touch each other
or any other metal part as this could damage this unit and/or
speakers.
Red: positive (+)
Black: negative (–)
1 Unscrew the knob.
2 Insert the bare wire.
3 Tighten the knob and
secure the wire.
NOTE: Use speakers with the specified impedance shown on the
rear of this unit.
NOTE: Banana Plug connections are also possible (except for
Europe model). Simply insert the Banana Plug connector into the
corresponding terminal.
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