T R O U B L E S H O O T I N G
If there is no sound from any of the speakers:
•Check that receiver/amplifier is on and that a source is playing.
•Review proper operation of your receiver/amplifier.
If there is no sound coming from one speaker:
•Check the “Balance” control on your receiver/amplifier.
•Check all wires and connec- tions between receiver/ amplifier and speakers.
•Make sure all wires are connected. Make sure none of the speaker wires are frayed, cut or punctured.
•Make sure no wires are touching other wires or terminals and creating a short circuit.
•Turn off all electronics and switch the speaker in question with one of the other speakers that is working correctly. Turn everything back on, and determine whether the problem is in the same place, i.e., the speaker that was working previously now has no sound and the speaker that was not working now sounds fine; or whether it has moved, i.e., the speaker that was not working still has no sound and the speaker that was working is still fine. If the problem is in the same place, the source of the problem is most likely with your receiver or amplifier, and you should consult the owner’s manual for that product for further information. If the problem has followed the speaker, consult your dealer for further assistance or, if that is not possible, visit our Web site at www.jbl.com for further information.
If the system plays at low volumes but shuts off as volume is increased:
•Check all wires and connec-
tions between receiver/ | • In Dolby Digital or DTS mode, | |||||||
amplifier and speakers. | make sure your receiver/ |
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• Make sure all wires are | processor is configured so that | |||||||
connected. Make sure none of | the subwoofer and LFE output |
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the speaker wires are frayed, | are enabled. |
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cut or punctured. |
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• If more than one pair of | If you are using the S412PII |
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main speakers is being used, | LFE/Subwoofer input and the |
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check the minimum | impedance | bass level decreases (instead |
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requirements of your | receiver/ | of increasing) when you turn |
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amplifier. |
| the LFE/Subwoofer Level knob |
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If there is no (or low) | bass | clockwise: |
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• Recheck to make sure that |
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output: |
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| your receiver or amplifier- |
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• Make sure the polarities |
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speaker outputs are correctly |
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(+ and |
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connected to the S412PII |
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“Speaker Inputs” are |
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speaker inputs |
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connected properly. |
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binding posts), (+) to (+) and |
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• Make sure that the speaker |
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to |
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is plugged into an active |
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has a red stripe and is located on | ||||||||
electrical outlet and switched | ||||||||
the |
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on, and that the green LEDs are |
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letter “L” of the molded JBL logo, | ||||||||
displayed. | ||||||||
when looking directly at the back | ||||||||
• In Dolby Digital or DTS mode, | ||||||||
of the S412PII. |
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make sure your receiver/ | • If the wires are connected |
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processor is configured so that |
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properly, the confusion may be |
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the subwoofer and LFE output |
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attributable to the design of your |
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are enabled. |
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receiver/amplifier. Your unit may |
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If you used the LFE input and | have inverting inputs, which |
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reverse the polarity of the signal |
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there is no sound from the |
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between the inputs and outputs |
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subwoofer: |
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of the amplifier. To check if this is | ||||||||
• Check that receiver/amplifier | ||||||||
the case, reverse the speaker |
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is on and that a source is |
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connections for ALL S412PII’s in |
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playing. |
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your system (and disconnect any | ||||||||
• Make sure that the speaker | ||||||||
other speakers in the system) |
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is plugged into an active |
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so | that the receiver/amplifier | ’s |
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electrical outlet and switched |
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(+) | connector is connected | to |
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on, and that the green LEDs are |
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each S412PII’s |
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displayed. |
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speaker connector. If you do |
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• Check all wires and connec- |
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this and the S412PII’s function |
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tions between receiver/ |
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properly (bass increases as you | ||||||||
amplifier and speakers. | ||||||||
turn your LFE/Subwoofer level- |
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• Make sure all wires are |
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control knobs clockwise), your |
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connected. Review the “Line- |
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receiver/amp uses inverting |
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Level Connections” section on |
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inputs. This is not a problem. |
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page 5 of this manual and make |
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Simply connect all of the |
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sure that a single RCA patch |
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speakers in your system the |
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cord is connected to each |
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same way, with the receiver or |
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loudspeaker from the |
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amplifier’s (+) terminal to the |
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speaker’s |
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receiver/amplifier’s subwoofer |
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receiver or amplifier’s |
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output. Make sure none of the |
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terminal to the speaker’s (+) | 7 |
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speaker wires are frayed, cut |
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terminal. |
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or punctured. |
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