Yamaha DSP-A3090 - Manual (Page 33)

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English
ADDING A SUBWOOFER
You may wish to add a subwoofer to reinforce the bass
frequencies.
This unit provides line-level subwoofer outputs. If you use one
subwoofer, connect the MONO SUBWOOFER jack to the INPUT
jack of the subwoofer amplifier, and connect the speaker terminals of
the subwoofer amplifier to the subwoofer.
If you wish to obtain more presence in your listening room, the
use of two subwoofers is recommended. To connect two subwoofers
to this unit, connect the “left” SPLIT SUBWOOFER jack to the INPUT
jack of the amplifier driving the left subwoofer, and the “right” SPLIT
SUBWOOFER jack to the INPUT jack of the amplifier driving the
right subwoofer, and then connect each subwoofer to the
corresponding amplifier.
With some subwoofers, including the Yamaha Active Servo
Processing Subwoofer System, the amplifier and subwoofer are in
the same unit.
OUT IN
CENTER
MONO SPLIT
SUB
WOOFER
L R
Subwoofer system
Subwoofer system Subwoofer system
OUT IN
CENTER
MONO SPLIT
SUB
WOOFER