T R O U B L E S H O O T I N G

If there is no sound from

If there is no (or low) bass

any of the speakers:

output:

• Check that receiver/

• Make sure the polarities

amplifier is on and that a

(+ and –) of the left and

source is playing.

right “Speaker Inputs” are

• Review proper operation

connected properly.

of your receiver/amplifier.

• Make sure that the

 

 

speaker is plugged into an

If there is no sound coming

active electrical outlet and

switched on, and that the

from one speaker:

green LEDs are displayed.

• Check the “Balance”

 

 

 

control on your

If you used

the LFE

input

receiver/amplifier.

and there is

no sound

from

• Check all wires and

the subwoofer:

 

connections between

 

• Check that receiver/

 

receiver/amplifier

 

amplifier is on and that a

and speakers.

source is playing.

• Make sure all wires are

• Make sure that the

connected. Make sure

speaker is plugged into an

none of the speaker wires

active electrical outlet.

are frayed, cut or

punctured.

• Check all wires and

 

 

connections between

If the system plays at low

receiver/amplifier and

speakers.

volumes but shuts off as

• Make sure all wires are

volume is increased:

connected. Review the

• Check all wires and

“Line-Level Connections”

connections between

section on page 5 of this

receiver/amplifier

manual and make sure that

and speakers.

 

 

a single RCA patch cord

• Make sure all wires are

is connected to each

connected. Make sure

loudspeaker from the

none of the speaker

Y-Connector plugged into

wires are frayed, cut or

the receiver/amplifier’s

punctured.

subwoofer output. Make

• If more than one pair of

sure none of the speaker

wires are frayed, cut or

main speakers is being

punctured.

used, check the minimum

impedance requirements of

• Review proper operation

your receiver/amplifier.

of your receiver/amplifier,

 

 

including making sure that

 

 

you have configured your

 

 

receiver so that the sub-

 

 

woofer output is active.

If you are using the S412P LFE/Subwoofer input and the bass level decreases (instead of increasing) when you turn the LFE/ Subwoofer Level knob clockwise:

•Recheck to make sure that your receiver or amplifier-speaker outputs are correctly connected to the S412P speaker inputs (gold-plated binding posts),

(+) to (+) and (–) to (–). The S412P (+) terminal has a red stripe and is located on the right-hand side, below the letter “L” of the molded JBL logo, when looking directly at the back of the S412P.

•If the wires are connected properly, the confusion may be attributable to the design of your receiver/ amplifier. Your unit may have inverting inputs, which reverse the polarity of the signal between the inputs and outputs of the amplifier. To check if this is the case, reverse the speaker con- nections for ALL S412Ps in your system (and disconnect any other speakers in the system) so that the receiver/amplifier’s (+) connector is connected to each S412P’s (–) (black stripe) speaker connector. If you do this and the S412Ps function properly (bass increases as you turn your LFE/Subwoofer level- control knobs clockwise), your receiver/amp uses inverting inputs. This is not a problem. Simply connect all of the speakers in your system the same way, with the receiver or amplifier’s

(+) terminal to the speaker’s (–) terminal, and the receiver or amplifier’s (–) terminal to the speaker’s (+) terminal.

7

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JBL S412P manual Any of the speakers Output, From one speaker, Input, Subwoofer, Volume is increased
Page 6 Page 8

S412P specifications

The JBL S412P is a powerful subwoofer that stands out in the realm of home audio systems. Designed to deliver deep, resonant bass, this model brings a new dimension to your listening experience, whether you're enjoying music, movies, or gaming. With a robust construction and advanced features, the S412P is tailored for both audiophiles and casual listeners.

One of the main features of the JBL S412P is its high-performance 12-inch driver, which is engineered to produce lower frequencies with remarkable clarity and depth. This driver is accompanied by a well-designed enclosure that optimizes the sound produced, minimizing distortion and enhancing the overall output. The subwoofer is capable of delivering an impressive power output, allowing it to fill large rooms with strong, impactful bass that resonates throughout the space.

The S412P incorporates JBL’s advanced technology, including an innovative low-pass filter, which ensures that only the appropriate bass frequencies are played through the subwoofer. This technology allows for a seamless blend of low-end frequencies with the main speaker system, creating a more immersive and cohesive listening experience. Additionally, the subwoofer features adjustable phase control, enabling users to synchronize the bass output with their existing speakers for optimal sound balance.

Another characteristic that sets the S412P apart is its versatile connectivity options. It includes both line-level and speaker-level inputs, making it compatible with various audio sources, from modern AV receivers to older audio systems. This flexibility makes it an easy addition to any home audio setup, so whether you're upgrading an existing system or starting from scratch, the S412P can adapt to your needs.

The design of the JBL S412P is equally noteworthy. With its sleek cabinet finish and robust build quality, it not only performs exceptionally well but also looks great in any living space. Its understated design complements a range of interior styles, making it a stylish yet functional addition to your home audio setup.

Overall, the JBL S412P stands out for its combination of power, advanced technology, and user-friendly features. Whether for movie nights or music listening, it enhances sound quality significantly, making every auditory experience richer and more enjoyable. With its impressive performance capabilities, the S412P is a worthy investment for anyone looking to elevate their audio experience at home.
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