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suBwooFer rear-Panel controls and connectIons

On/Standby LED: 

When the Power-On Mode switch is in the “Auto” 

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 Power switch is set to “Off,” the LED will not light up, no matter 

what setting the Power-On Mode switch is in.

Crossover Control: 

This control determines the highest frequency at 

which the subwoofer reproduces sounds. The higher you set the Cross-

over control, the higher in frequency the subwoofer will operate and the 

more its bass will “overlap” that of the satellite speakers. This adjust-

ment 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 you are using the Line-

Level In L/R connectors. The Line-Level In LFE connector bypasses the 

subwoofer’s built-in crossover and Crossover control. 

Phase Switch: 

This switch determines whether the subwoofer driver’s 

piston-like action moves in and out in phase with the satellite speakers. If 

the subwoofer were to play out of phase with the satellite speakers, the 

sound waves from the satellites 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 each other in the room. 

Power-On Mode Switch: 

When this switch is set in the “Auto” posi-

tion and the Power switch is set to “On,” the subwoofer will automatically 

turn itself on when it receives an audio signal and will enter the Standby 

mode when it has gone without receiving an audio signal for 20 minutes. 

When this switch is set in the “On” position, the subwoofer will remain on 

whether or not it is receiving an audio signal.

Subwoofer Level 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.

Line-Level In LFE Connector:

 This input bypasses the subwoofer’s 

internal crossover circuitry, so use it only with a receiver or processor sub-

woofer output that has been low-pass filtered. If your receiver or processor 

does not have a dedicated subwoofer output that is low-pass filtered, use 

the subwoofer’s Line-Level In L/R Connectors (see below) instead.

Use the supplied mono RCA cable (purple connectors) to connect the 

Line-Level In LFE connector to the dedicated subwoofer output of a 

receiver or preamp/processor.

Line-Level In L/R Connectors:

 These inputs pass through the subwoof-

er’s built-in crossover. Use them if your receiver or preamp/processor does 

not have a dedicated subwoofer output that is low-pass filtered.

Power Switch:

 Set this switch in the “On” position to turn the subwoofer 

on. The subwoofer will then be in On or Standby mode, depending on the 

setting of the Power-On Mode switch.

Power Cord: 

After you have made and verified all subwoofer and speaker 

connections described in this manual, plug the power cord into an ac-

tive, 

unswitched

 electrical outlet for proper operation of the subwoofer. 

DO NOT

 plug this cord into the accessory outlets found on some audio 

components.

This Class B digital apparatus complies with Canadian ICES-003.

Cet appareil numérique de la classe B est conforme à la norme 

NMB-003 du Canada.

Subwoofer 

Level Control

Crossover 

Control

On/Standby 

LED

Phase Switch

Power-On 

Mode Switch

Line-Level In 

LFE Connector

Line-Level In 

L/R Connectors

Power Switch

Power Cord 

Содержание SUB140P

Страница 1: ... and automatic turn on off the SUB140P is also simple to connect and set up We re confident that this JBL subwoofer will provide every note of enjoyment that you expect and that when you think about pur chasing additional audio equipment for your home car or office you will once again choose JBL products This quick start guide contains all the information you need to set up connect and adjust your...

Страница 2: ...or long periods of time 14 Refer all servicing to qualified service personnel Servicing is required when the apparatus has been damaged in any way such as when the power supply cord or plug has become damaged when liquid has been spilled or objects have fallen into the apparatus when the appa ratus has been exposed to rain or moisture when the apparatus does not operate normally or the apparatus h...

Страница 3: ...gnal and will enter the Standby mode when it has gone without receiving an audio signal for 20 minutes When this switch is set in the On position the subwoofer will remain on whether or not it is receiving an audio signal Subwoofer Level 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 Lin...

Страница 4: ...fect of standing waves on bass performance This effect can vary depending on the listening position some listening positions may yield very good results while others may have far too much or too little bass at certain frequencies In many rooms placing the subwoofer along the same plane as the left and right speak ers 2 can produce the best integration between the sound of the subwoofer and that of...

Страница 5: ...too quiet for music When set ting the subwoofer volume listen to both music and films with strong bass content and find a middle ground volume level that works for both I f your subwoofer always seems too loud or too quiet you may want to place it in a different location Placing the subwoofer in a corner will tend to increase its bass output while placing it away from any walls or corners will ten...

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