JBL PSW-D112 Service Manual page 10

Amplifier/Subwoofer
Receiver/amplifier is on and a source is playing.
Powered subwoofer is plugged in.
Check all wires and connections between
receiver/amplifier and speakers. Make sure all wires
are connected. Make sure none of the speaker
wires are frayed, cut or punctured.
Review proper operation of your receiver/amplifier.
If there is low bass output, check the following:
Make sure the connections to the left and right
"Speaker Inputs" have the correct polarity (+ and –).
Make sure that the subwoofer is plugged into an
active electrical outlet.
Adjust the crossover point.
Flip the Phase Control Switch to the opposite
position.
If you are using a Dolby* Digital/DTS
processor, make sure that the subwoofer
adjustments on the receiver/processor are set up
correctly.
Slowly turn the level Control clockwise until you
begin to hear the desired amount of bass.
If you used the line-level inputs and there is no
sound from the subwoofer, check the following:
Receiver/amplifier is on and a source is playing.
Powered subwoofer is plugged in.
Check all wires and connections between receiver/
amplifier and subwoofer. Make sure all wires are
connected. Make sure none of the wires are frayed,
cut or punctured.
Review proper operation of your receiver/amplifier.
Slowly turn the level Control clockwise until you
begin to hear the desired amount of bass.
Make sure that you have configured your
receiver/processor so that the subwoofer/LFE output
is on.
receiver or
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PSW-D112/DPS-12
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