Yamaha NS-SW700 - Manual (Page 11)

CONNECTIONS
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■ Using two subwoofers
■ Connecting to the LFE (INPUT3) terminal(s)
If your amplifier can cut off high frequencies from the
signals for sending to the subwoofer, connect the amplifier
to the subwoofer's LFE (INPUT3) terminal(s).This will
bring you higher sound quality because the signal routing
in the subwoofer is shortened by passing the built-in HIGH
CUT circuit.
Amplifier
To AC outlet To AC outlet
Mono pin cable (not included)
Mono pin cable
(not included) Subwoofer Subwoofer