Harman JBL BassPro SL2 User manual

BassPro SL2 Quick Start Guide
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THANK YOU
for choosing the JBL BassPro SL2. BassPro SL2 has been
designed to provide the kind of high-performance low-frequency
reproduction that used to require big, clumsy enclosures, large
amplifiers, and complex installation. To ensure maximum
performance, we strongly recommend that installation be
entrusted to a qualified professional.
WARNING
Playing loud music in an automobile can permanently damage
your hearing as well as hinder your ability to hear traffic. We
recommend using low volume levels while driving. Harman
International accepts no liability for hearing loss, bodily injury or
property damage resulting from the use or misuse of this product.
INSTALLATION
Choosing a mounting location
Choose a location that doesn't interfere with the loading or
unloading of cargo, fold-down rear seats, or opening or closing of
the trunk lid. The best location is likely to be the front or rear
corner of the trunk or luggage compartment. These locations, in
addition to being out of the way, will provide the best sonic
reproduction in the 60Hz - 100Hz range because the output of
the woofer will be "corner loaded" against the walls of the vehicle.
In any case, the BassPro SL2 must not interfere with the safe
operation of the vehicle.
CAUTION: Make sure mounting screws will not puncture wiring
harnesses, brake or fuel lines, or the vehicle's fuel tank. Some or
all of these may be located behind or under the mounting surface.
Mounting BassPro SL2
IMPORTANT: Disconnect the vehicle's negative(-) battery
terminal before beginning the installation.
CONNECTIONS
Power Connections
Power
Connectors
BassPro SL2
I"'----------,
, I +BAT REM GND I
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Head Unit
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J Remote Tum-On (optional) _J
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=*o o 000000 o o >#18AWG (0.82mm') Wire
Chassis Ground
(bare metal)
1
>#12AWG (2.05mm') Wire
> #12AWG (2 . 05mm') Wire
NOTE: If you are using only the BassPro SL2's line-level (RCA)
inputs, you must connect the remote wire from the BassPro SL2 to
the system's head unit so BassPro SL2 will tum on and off with the
system. If you will be using the speaker-level outputs from your
head unit, you do not need to connect the remote output. The
BassPro SL2's speaker-level inputs will sense voltage on the
speaker wires and the BassPro SL2 will turn itself on. (See Audio
Sense Switch, below.)
Input Connections
Connect the subwoofer output from the
source unit to either the left or right
line-level input. If your source unit does
not have a dedicated subwoofer output
you can connect the rear left/right
outputs to the BassPro SL2's left and
right inputs.
If your source unit doesn't have
line-level outputs you can use the
included speaker-level input harness to
connect the BassPro SL2 to the source
unit's speaker outputs. See the
illustration for the wiring configuration.
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TUNING BASSPRO SL2
BassPro SL2 provides several controls that simplify sonic
integration with virtually any vehicle's unique acoustic properties.
Please read the following section carefully to familiarize yourself
with the function of each control.
Crossover
Con1rol
Line- N.ldlo
Power Remote Level Sense Level
Connections Comectioo lnpulS SWlll:h Con1rol
Fuse High-Level
(15A) Input
Input Phase Bass
Load Switch Boost
Switch Control
Phase Switch: This switch will reverse the phase of BassPro
SL2's output with respect to its input. When installing BassPro SL2
with an existing factory or aftermarket system, depending on
BassPro SL2's location in the vehicle and the distance between it
and the other speakers in the car, changing the setting of the
phase switch may produce a discernable increase or decrease in
the amount of upper bass reproduced. Although the position that
yields the most upper bass is technically correct, you may choose
the position that best suits your taste.
Level Control: This control will adjust the input sensitivity of
BassPro SL2. Use this control to adjust the relative volume
{loudness) of BassPro SL2 with respect to the other speakers in
the vehicle.
Crossover Control: The crossover control adjusts the amount of
upper bass and midbass information present in BassPro SL2's
output. After listening to music on the system for a time, fine-tune
the Crossover control setting to achieve a smooth transition from
the BassPro SL2 to the rest of the system's speakers while
avoiding a "hole," where the sounds that occur between the
BassPro SL2 and other speakers seem to drop out.
Bass Boost Control: BassPro SL2's interaction with the
acoustics of your vehicle may produce a peak or dip in BassPro
_SL2's response. For the vast majority of vehicles, these peaks or
dips occur at about 40Hz -around the frequency of the lowest
bass guitar note. Use the Bass Boost control to correct that peak
or dip. Adjustment between 0dB and +9dB is possible. Although
response without any sharp peaks or dips is technically correct,
you may choose the position that best suits your taste.
Audio Sense Switch: If you have used the High-Level inputs to
connect the BassPro SL2 to your system's radio/head unit (see
Input Connections, above), set the Audio Sense switch in the
"On" position. This will allow the BassPro SL2 to sense voltageon
the speaker inputs and turn itself on when the rest of the audio
system turns on.
Input Load Switch: This switch has an effect only when you
have used the High-Level inputs to connect the BassPro SL2 to
your system's radio/head unit. For the lowest noise in most
applications, set the Input Load switch in the "High" position. In
some cases, (such as when using the radio's power fader), the
"Low" position may produce better results.
Remote Connection: This connector is compatible with the
RBC remote volume control .
Adjustment sequence
1. Start with Level control set to minimum, the Phase switch set
to "0" and the Crossover and Bass Boost controls rotated to
the 3 o'clock position.
2. Choo.se program material with substantial bass content and
turn the volume control on your head unit to three-quarters of
its total output (approximately 3 o'clock on rotary controls).
3. Adjust the gain control clockwise until the BassPro SL2's
volume sounds balanced with the rest of the system.
4. Continue listening, making a mental note of the amount of
upper bass present in your system.
5. Switch the Phase switch to "180" and recheck for upper bass
content. There may be more upper bass, less upper bass, or
there may be no change. The position that provides the most
upper bass is correct, but you may choose either setting
according to your taste.
6. Adjust the Crossover control clockwise or counterclockwise
until the perceived output from BassPro SL2, as heard at the
listening position, contains only low-frequency information;
i.e., you should NOT hear any vocals coming from BassPro SL2
when you are seated in the normal listening position.
7. Adjust the Bass Boost control clockwise or counterclockwise
to suit your taste.
Note: Although this adjustment sequence will in most cases
provide satisfactory tuning, the actual process may include
several readjustments of each of the controls since their settings
will interact with each other. If necessary, consult your authorized
JBL car audio dealer for help in tuning your system.
SPECIFICATIONS
Amplifier Power : 125Wrms
Frequency Response : 35Hz -120Hz
Fuse : 15A
Maximum Current Draw : 12A
Quiescent Current Draw : <800mA
Input Sensitivity : 0.05 V - 2.0 V Low-Level Input;
0.5 V - 20V High-Level Input
Crossover Frequency : 50Hz -120Hz
Crossover Slope : 12dB/octave
Bass Boost : 0dB to +9dB @ 70Hz
Dimensions 0N x H x D) : 13-9/16" x 9-7/8" x 2-13/16"
{344mm x 250mm x 71 mm)
~
HARMAN
HARMAN International
Industries, Incorporated
8500 Balboa Boulevard,
Northridge, CA 91329 USA
© 2019 HARMAN International Industries, Incorporated. All rights reserved.
~
JBL is a trademark of HARMAN International Industries, Incorporated, registered in the
United States and/or other countries. All Rights Reserved. Features, specifications and
appearance are subject to change without notice.

Big bass from a compact powered subwoofer system.
The BassPro SL powered woofer fits under the front seat of many vehicles, and adds
powerful bass to any car audio system. An electronic crossover and flexible EQ adjustments
let you tune the BassPro SL to your system, your car’s acoustic environment and your
listening preferences. The energy-efficient digital amplifier provides a powerful engine to
drive the subwoofer while staying cool even when driven hard. The BassPro SL delivers great
bass output without taking up a lot of space.
Features
Proprietary, shallow-profile woofer
Efficient Class D amplifier
Intelligent electronic design
System Control
Line- and high-level inputs
Wired, remote level control capability
BassPro SL
Powered, 8"(200mm) car audio under seat woofer system

SUGGESTIONS FOR CONNECTING BATTERIES IN PARALLEL
• Use batteries of the same age, make and model.
• Make sure the cable size is sufficient to handle the higher current flow.
• Protect cables from shorting.
• Clean all terminals before installation.
• Use high-quality connectors
BATTERY INSTALLATION TIPS
• Check the mounting surface for any objects that may cause damage to the case.
• Make sure the battery is properly secured in the vehicle to prevent movement or vibration.
• Replace any cables and connectors that have corrosion, rust or other damage.
• Do not lift the batteries by the thermals.
• Do not overtighten the bolts.
HOW YOUR CHARGING SYSTEM WORKS
The battery’s job is to start your vehicle. Running the electrical accessories is the
alternator’s job. The battery isn’t designed to be a continuous source of power.
It is a renewable source and is charged by the alternator when the engine runs.
Battery charging can only occur when the current demand from the electrical
accessories is less than the total current-output capacity of the alternator.
BATTERY APPLICATIONS
When deciding what battery to use, or how many batteries are needed, you must
meet or exceed the power and capacity requirements of your application. You
should also consider what kind of cycling the battery will be subjected to. Any
application where the battery is repeatedly deep-discharged and recharged
will require a deep-cycle battery. This includes applications such as car audio
systems, recreational vehicles and emergency vehicles.
CONNECTING MULTIPLE BATTERIES IN PARALLEL
If your battery application requires more starting power or reserve capacity than one battery can provide, you can install multiple batteries in parallel
by connecting the “same” terminals together (positive to positive/negative to negative). Each time you add a battery in parallel, you increase the
CCA (cold cranking amps) and reserve capacity, while the voltage remains the same.
CAR AUDIO INSTALLATION TIPS
UNDERSTANDING BATTERIES
© 2016 HARMAN International Industries, Incorporated. All rights reserved. JBL is a trademark of
HARMAN International Industries, Incorporated, registered in the United States and/or other
countries. Features, specifications and appearance are subject to change without notice.
HARMAN International Industries, Incorporated
8500 Balboa Boulevard, Northridge, CA 91329 USA
www.jbl.com

A fuse is connected directly into an electrical circuit. Fuses are designed to interrupt the power to a circuit when the current flow exceeds safe
levels. lf the electric current surges to a dangerous level, the metal in the fuse melts, and the circuit is broken. Never substitute a fuse of greater
capacity than that specified for a particular circuit. If the fuse has the ability to carry more current than originally designed, then the wires will heat
up before the fuse melts, which could start a fire.
Installing a fuse of the proper amperage on your power cable protects everything between the fuse and your gear from a short circuit. A short circuit
occurs when a current-bearing wire makes contact with bare metal (like your car chassis). Because your entire car chassis can be considered
“negative” or ground, you can think of a short circuit as positive touching negative. You definitely don’t want this to happen, but if it does, then a
properly installed fuse will prevent a fire or other damage.
If you’re installing just one amplifier, the fuse at the battery should simply match or slightly exceed the fuse rating of the amplifier itself. If you’re
installing two or more amplifiers, just add their fuse ratings together, and install a fuse rated roughly equal to this sum. Generally, it’s better to go
slightly higher than lower, but a margin of five amperes is acceptable.
You do not need a separate fuse block unless your amplifiers are among the few that don’t come with fuses installed. The reason you see these
distribution fuse blocks is that in the early days of car audio competition, amplifiers frequently didn’t include their own fuses, or they were hidden
behind panels that were hard to get to, especially in the heat of competition. Today, the use of such fuse blocks is largely a matter of style. But
that’s OK – looking cool definitely counts.
CAR AUDIO INSTALLATION TIPS
FUSES
© 2016 HARMAN International Industries, Incorporated. All rights reserved. JBL is a trademark of
HARMAN International Industries, Incorporated, registered in the United States and/or other
countries. Features, specifications and appearance are subject to change without notice.
HARMAN International Industries, Incorporated
8500 Balboa Boulevard, Northridge, CA 91329 USA
www.jbl.com

SETTING INPUT SENSITIVITY
There are several methods of properly adjusting the sensitivity (or gain) setting on an amplifier. The goal is to achieve the maximum clean output
that the amp is capable of delivering. The following steps are an overview, requiring no additional test equipment:
1. Turn the input-level control on the amp to minimum (fully counter-clockwise).
2. Play your favorite music, and turn up the source unit’s volume control until:
• You hear distortion on the speakers connected to the amp (this can happen even with low output), or
• You reach about 3/4 volume setting.
3. When you begin to hear distortion, you have exceeded the maximum setting for the volume control on the receiver. Turn the volume down slightly
until the distortion is eliminated. This is the highest clean signal available from the receiver.
4. Now you can turn up the input level on the amp to a comfortable volume. If you begin to hear distortion, turn the input level down slightly.
NOTE: You can use the supplied remote level control to adjust the level of the bass, according to the program material after the amplifier’s level
control has been set properly.
CAR AUDIO INSTALLATION TIPS
© 2016 HARMAN International Industries, Incorporated. All rights reserved. JBL is a trademark of
HARMAN International Industries, Incorporated, registered in the United States and/or other
countries. Features, specifications and appearance are subject to change without notice.
HARMAN International Industries, Incorporated
8500 Balboa Boulevard, Northridge, CA 91329 USA
www.jbl.com
SETTING THE CROSSOVER AND INPUT SENSITIVITY
IMPORTANT: If you plan to use the amplifier to drive full-range speakers, then, set the crossover-mode switch to “FLAT,” and skip to the “Setting
Input Sensitivity” section.
SETTING THE CROSSOVER
1. Depending on your system plan, set the amplifier’s crossover-mode switch to “LP” (low pass) or “HP” (high pass). Some JBL®and Infinity®
amplifiers are low-pass amplifiers only, designed to drive subwoofers. No crossover switch is provided.
2. The crossover slope has two settings: 12 (dB per octave) or 24 (dB per octave). Select the slope that best suits your taste, but consider that a
steeper low-pass filter will make the subwoofer’s sound less directional (since more midrange will be filtered from the signal). A steeper high-
pass filter will reduce a small speaker’s unnecessary cone excursion at the lowest frequencies, which will increase power handling and reduce
distortion.
3. Set the amplifiers HP-Freq control to allow the speakers to make as much bass as possible while minimizing distortion caused by small
speakers trying to reproduce the lowest frequencies. The best setting is one where the speakers produce crisp, clear impact without being
overdriven.
4. Set the amplifiers LP-Freq control so vocal information is not reproduced by the subwoofers, and the subwoofers’ sound blends with the sound
of the midrange speakers without any missing information.
NOTE: The crossover can be set to any frequency between 32Hz and 320Hz.

© 2015 HARMAN International Industries, Incorporated. All rights reserved. JBL is a trademark of
HARMAN International Industries, Incorporated, registered in the United States and/or other countries.
Features, specifications and appearance are subject to change without notice.
BassPro SL
HARMAN International Industries, Incorporated
8500 Balboa Boulevard, Northridge, CA 91329 USA
www.jbl.com
What’s in the Box
1 powered woofer enclosure
4 mounting screws
Owner’s manual
Technical Specifications
BassPro SL
Description: Powered, under seat woofer enclosure
Woofer: 8" (200mm)
Amplifier Power: 125W RMS
Frequency Response: 35Hz – 120Hz
Fuse: 20A
Maximum Current Draw: 12A
Quiescent Current Draw: <800mA
Input Sensitivity: 0.2V – 2V Line-Level Input;
2V – 20V High-Level Input
Crossover Frequency: 50Hz – 120Hz
Crossover Slope: 12dB/octave
Bass Boost: 0dB to +9dB @ 70Hz
Dimensions (L x W x H): 13-9/16" x 9-7/8" x 2-13/16"
(344mm x 250mm x 71mm)
Proprietary, shallow-profile woofer
The 8" (200mm) woofer in the BassPro SL is designed specifically to provide low
distortion, great bass performance contained in our proprietary ABS enclosure, which
has a remarkably compact footprint.
Efficient Class D amplifier
The amp that powers the BassPro SL produces minimal heat, and it doesn’t require a lot
of current from the car’s electrical system.
Intelligent electronic design
The BassPro SL employs custom circuitry to protect and provide optimum performance
at varying output levels without impacting performance or clarity.
System Control
An electronic crossover control provides variable adjustment from 50Hz – 120Hz
allowing you to dial-in BassPro SL to best integrate with the rest of your car audio system.
Line- and high-level inputs
For added installation flexibility, the BassPro SL features both line- and high-level
inputs allowing you to connect to both factory installed and aftermarket systems.
If you use the high-level inputs to connect the BassPro SL to the head unit, an input
load switch lets you switch from “Low” to “High” to achieve optimum results.
Wired, remote level control capability
The BassPro SL is compatible with the RBC Remote Bass Controller (sold separately),
which enables you to control the level remotely.
Powered, 8"(200mm) car audio under seat woofer system