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/

 

 

• Make sure all wires are

processor is configured so that

connected. Make sure none of

the subwoofer and LFE output

 

 

the speaker wires are frayed,

are enabled.

 

 

cut or punctured.

 

 

 

 

 

 

• If more than one pair of

If you are using the S412PII

 

 

main speakers is being used,

LFE/Subwoofer input and the

 

 

check the minimum

impedance

bass level decreases (instead

 

 

requirements of your

receiver/

of increasing) when you turn

 

 

amplifier.

 

the LFE/Subwoofer Level knob

 

 

If there is no (or low)

bass

clockwise:

 

 

• Recheck to make sure that

 

 

output:

 

 

 

 

your receiver or amplifier-

 

 

• Make sure the polarities

 

 

speaker outputs are correctly

 

 

(+ and –) of the left and right

 

 

connected to the S412PII

 

 

“Speaker Inputs” are

 

 

speaker inputs (gold-plated

 

 

connected properly.

 

 

binding posts), (+) to (+) and (–)

 

 

• Make sure that the speaker

 

 

to (–). The S412PII (+) terminal

 

 

is plugged into an active

 

 

has a red stripe and is located on

electrical outlet and switched

the right-hand side, below the

 

 

on, and that the green LEDs are

 

 

letter “L” of the molded JBL logo,

displayed.

when looking directly at the back

• In Dolby Digital or DTS mode,

of the S412PII.

 

 

make sure your receiver/

• If the wires are connected

 

 

processor is configured so that

 

 

properly, the confusion may be

 

 

the subwoofer and LFE output

 

 

attributable to the design of your

 

 

are enabled.

 

 

receiver/amplifier. Your unit may

 

 

 

 

 

 

If you used the LFE input and

have inverting inputs, which

 

 

reverse the polarity of the signal

 

 

there is no sound from the

 

 

between the inputs and outputs

 

 

subwoofer:

 

 

of the amplifier. To check if this is

• Check that receiver/amplifier

the case, reverse the speaker

 

 

is on and that a source is

 

 

connections for ALL S412PII’s in

 

 

playing.

 

 

your system (and disconnect any

• Make sure that the speaker

other speakers in the system)

 

 

is plugged into an active

 

 

so

that the receiver/amplifier

’s

 

 

electrical outlet and switched

 

 

(+)

connector is connected

to

 

 

on, and that the green LEDs are

 

 

each S412PII’s (–) (black stripe)

 

 

displayed.

 

 

speaker connector. If you do

 

 

• Check all wires and connec-

 

 

this and the S412PII’s function

 

 

tions between receiver/

 

 

properly (bass increases as you

amplifier and speakers.

turn your LFE/Subwoofer level-

 

 

• Make sure all wires are

 

 

control knobs clockwise), your

 

 

connected. Review the “Line-

 

 

receiver/amp uses inverting

 

 

Level Connections” section on

 

 

inputs. This is not a problem.

 

 

page 5 of this manual and make

 

 

Simply connect all of the

 

 

sure that a single RCA patch

 

 

speakers in your system the

 

 

cord is connected to each

 

 

same way, with the receiver or

 

 

loudspeaker from the

 

 

amplifier’s (+) terminal to the

 

 

Y-Connector plugged into the

 

 

speaker’s (–) terminal, and the

 

 

receiver/amplifier’s subwoofer

 

 

receiver or amplifier’s (–)

 

 

output. Make sure none of the

 

 

terminal to the speaker’s (+)

7

 

speaker wires are frayed, cut

 

terminal.

 

or punctured.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Page 7
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JBL S412PII manual Troubleshooting, Bass Clockwise, Output, Subwoofer