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Phase switch: This switch determines whether the subwoofer
transducer's piston-like action moves in and out in phase with the main
speakers. If the subwoofer were to play out of phase with the main
speakers, the sound waves from the main speakers could partially cancel
out the sound waves from the subwoofer, reducing bass performance
and sonic impact. This phenomenon depends in part on the placement of
all the speakers relative to the listening position and to each other in the
room.
Input mode switch: When this switch is in the “Normal” setting,
the input signal from both Line In connectors is routed through the
subwoofer's built-in low-pass crossover network. When the switch is in the
“LFE” setting, the input signal from the LFE Input connector bypasses the
subwoofer's built-in crossover network.
Volume control: Use this control to adjust the subwoofer’s volume.
Turn the knob clockwise to increase the volume; turn the knob
counterclockwise to decrease the volume.
crossover control: This control determines the highest frequency
at which the subwoofer reproduces sounds. The higher you set the
Crossover control, the higher in frequency the subwoofer will operate
and the more its bass will “overlap” that of the satellite speakers. This
adjustment helps achieve a smooth transition of bass frequencies between
the subwoofer and the satellites for a variety of different rooms and
subwoofer locations.
NOTE: The Crossover Control functions only when the Input Mode switch
is in the “Normal” setting.
on/standby led: When the Power switch is in the “On” position, this
LED indicates whether the subwoofer is in the On or Standby state:
• When the LED glows green, the subwoofer is turned on.
• When the LED glows red, the subwoofer is in the Standby mode.
• When the LED glows red, the subwoofer is in the Standby mode.
line In/lFe Input connectors:
• When you’re connecting the subwoofer to the dedicated subwoofer
output of a receiver/processor that has its own low-pass crossover
network, use the LFE Input connector and set the Input Mode switch in
the “LFE” position.
• When you're connecting the subwoofer to the preamp or subwoofer
outputs of a receiver/processor that does not have its own low-pass
crossover network, use both Line In connectors and set the Input Mode
switch in the “Normal” position. If your receiver/processor only has one
subwoofer output you can use either Line In connector.
Power switch: Set this switch in the “On” position to turn the subwoofer
on. The subwoofer will then be in the Standby mode. It will automatically
turn On when an audio signal is detected at its inputs, and will return
to the Standby mode when no audio signal is detected its inputs after
approximately 10 minutes.
If you will be away from home, or will not be using the subwoofer for an
extended period, set this switch in the “Off” position to conserve energy.
Power cord connector: After you have made and verified the
subwoofer’s input connections, plug the female end of the supplied IEC
power cord into the subwoofer’s Power Cord connector, and plug the
other end of the power cord into an active, unswitched electrical outlet for
proper operation of the subwoofer. DO NOT plug the power cord into the
accessory outlets found on some audio components.
suBwooFer rear-Panel controls and connectIons
Phase Switch
Input Mode Switch
Volume Control
Crossover Control
On/Standby LED
Power Switch
Line-Level/LFE
Input Connectors
Power Cord
Connector
0242CSK - JBL SUB150P OM_v3.indd 2
29/09/10 9:57:49
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SUB 150P/230 Service Manual
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