THANK YOU
™
for choosing the JBL BassPro II.
BassPro II has been designed to
deliver great bass performance from
a compact, easily installed powered
subwoofer enclosure.
To get the best performance from your
BassPro II, we strongly recommend
that installation be entrusted to a
qualified professional. Although these
instructions explain how to install
BassPro II in a general sense, they
do not show specific installation
methods that may be required for your
particular vehicle. If you do not have
the necessary tools or experience, do
not attempt the installation yourself.
Instead, please ask your authorized
JBL car audio dealer about pro-
fessional installation.
In order that we may better serve you
should you require warranty service,
please retain your original sales
receipt and register your BassPro II
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INSTALLING THE REMOTE
CONNECTING THE SUBWOOFER
LEVEL CONTROL TO BASSPROII
The Subwoofer Level Control may be
mounted under the dash or dismantled
and mounted in the dash for a factory-
installed appearance.
Choose a mounting location that
Route the cable behind the dash or
BassProII Connection Panel
allows easy access to the control,
and provides 1-3/4" clearance behind
the mounting surface. Drill a 9/32"
hole in the mounting surface. Feed
the Subwoofer Level Control’s
other interior panels and under the
carpet. Do not route the cable outside
the vehicle. Connect the RJ11 cable
between the RJ11 receptacle on the
BassProII and the receptacle on the
Subwoofer Level Control (Figure 6).
UNDER-DASH MOUNTING
Select a mounting location that allows
easy access to the control while driv-
ing. Using the Subwoofer Level Control
as a template, mark and drill holes in
the mounting surface. Attach the
potentiometer shaft (with the knob
removed) through the hole and use the
nut and washer provided to hold the
control in place (Figure 5).
Subwoofer Level Control using the
mounting screws provided (Figure 4).
IN-DASH MOUNTING
Disassemble the Subwoofer Level
Control by removing the two Phillips-
head screws on the front panel,
rear panel and on top. Remove the
Subwoofer Level Control’s bottom and
side panels. Slide the Subwoofer Level
Control’s PC board forward to release
the RJ11 connector from the back
panel and remove the board along with
the potentiometer, knob and connector
as a single assembly.
Control
Cable
Socket
Socket
for
Control
Cable
Rear View of
Level-Control
Circuit Board
Figure 6. Subwoofer Level Control electrical
connection.
Level-
Washer
Control
Circuit
Board
Hex Nut
H
Knob
Knob
Figure 5. In-dash mounting of the Subwoofer Level Control.
Figure 4. Under-dash mounting of the
Subwoofer Level Control.
3
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POWER CONNECTIONS
Connecting power to BassProII is
shown in Figure 7. Please observe
the following installation tips:
Use at least #12 AWG wire for the
Positive Battery (BATT +12) and Ground
) connections. If needed, use at
least #20 AWG wire for the remote
(REM) turn-on connection.
Route all power wires through a grom-
met in the vehicle’s firewall. If a factory
grommet is not available, install one.
Connect a short ground wire from
BassProII’s ground terminal ( ) to the
nearest bare metal surface. For a good
connection, use sandpaper to clear
paint from the metal surface and use
a screw with a lock (star) washer.
The remote (REM) connection requires
a +5 to +12 Vdc signal for BassProII
to turn on when using the line-level
connections. Most head units with
preamp outputs provide this remote
voltage signal. As an alternative,
connect this terminal to a switched
ignition circuit.
(
When using the high-level input con-
nections, BassProII will automatically
turn on when you turn on your radio.
In this case, the remote (REM) con-
nection is not needed. Use at least #20
AWG speaker wire for speaker-level
input connections.
Connect BassProII’s “BATT +12V”
terminal directly to the battery’s posi-
tive (+) terminal. Install a fuse holder,
with a 20A fuse, within 18" of the bat-
tery’s positive (+) terminal.
Chassis Ground
(Bare Metal)
Fuse 20A
18"
Battery
Remote
Turn-On
BassProII Connection Panel
Figure 7.
Source Unit
4
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BassProII
Connection Panel
APPLICATIONS
BassProII is equipped with two line-
level (RCA) inputs and two high-level
inputs. To help you plan the installation
of BassProII, we have included two
system application diagrams in
Figures 8 and 9. For more installation
suggestions, contact your local
Subwoofer Level Control
Right Speaker
Left Speaker
authorized JBL car audio dealer.
Figure 8. High-level connections.
Connect BassProII’s high-level
inputs to either the front or rear
speaker outputs of your head unit
(splice crimps not included).
Splices
(not supplied)
Splices
(not supplied)
Source Unit
BassProII
Connection Panel
Subwoofer Level Control
LF Speaker
RF Speaker
RCA Stereo Cables
(not supplied)
Figure 9. Line-level connections
with two outputs (single full-range
or subwoofer).
Source Unit
LR Speaker
RR Speaker
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5
CONTROLS AND FUNCTIONS
BassProII has controls and indicators
that help simplify sonic integration with
almost any vehicle’s unique acoustic
properties. These controls are located
on the amplifier panel, as shown in
Figure 10.
POWER LED: This indicator
will glow red when the BassProII
is operating.
AUTO TURN-ON: For speaker-
level connections, used this switch to
activate (or deactivate) BassProII’s
automatic turn-on circuit. For most
speaker-level applications, slide the
switch to the AUTO position. If you
prefer to use the remote (REM)
connection, slide the switch to the
OFF position.
3. Turn the head unit ON and play a
selection of your favorite music
track that has substantial bass.
4. Adjust the CROSSOVER control
counterclockwise, until you hear
only low-frequency information.
Example – you should not hear
vocals coming from BassProII
when seated in the normal listening
position.
5. Adjust the BASS CONTROL either
clockwise or counterclockwise to
suit your taste, and to avoid audible
distortion.
GAIN CONTROL: Use this
control to adjust the relative volume
(loudness) of BassProII with the other
speakers in the vehicle.
Power LED
Gain Control
Crossover
Remote Bass Control
Auto Turn-On
CROSSOVER: Use this control
to adjust the amount of high-frequency
information present in BassProII’s out-
put. A lower value signifies less high-
frequency content.
REMOTE BASS
CONTROL: Use this RJ-11 jack
to connect the supplied remote bass
control.
6. If you elect not to install the Remote
Bass Control, adjust the GAIN
control to the maximum level that
provides undistorted output from
the BassProII, with the head unit’s
volume control at its 3 o’clock
setting.
SETTING THE CONTROLS:
1. Make sure the head unit is off and
VOLUME control is set to minimum.
2. On BassProII’s amplifier panel, set
the CROSSOVER to its maximum
frequency of 120Hz, as shown in
Figure 10.
NOTE: In most cases the above steps
will provide you with satisfactory
NOTE: If using the REMOTE BASS
CONTROL, set GAIN to maximum
and set the BASS CONTROL to the
midpoint.
results. However, the actual process
may require several readjustments of
each control, since the settings will
interact with one another. If necessary,
consult your authorized JBL car audio
dealer for help in tuning your system.
Figure 10.
6
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TROUBLESHOOTING
PROBLEM
CAUSES AND SOLUTIONS
POWER LED is not lit.
1. Fuse is blown and needs
replacement.
2. Head unit not functioning properly.
3. Check remote turn-on, power and
ground connections.
POWER LED is lit but there is no bass.
Output sounds muddy or distorted.
1. Inputs are not connected. Check
connections.
2. Head-unit fader controls are not set
properly. Adjust head-unit controls to
feed audio signals to BassProII.
3. Incorrect GAIN control setting.
1. GAIN is set too high.
2. Bass level is set too high on
head unit.
3. Head unit output is distorted or
blown. See your authorized JBL car
audio dealer.
Output gets louder when the head-unit
balance is adjusted to L or R.
Using speaker-level connection: one of
the speaker connections is reversed
(+/–). Reverse one channel.
POWER LED remains ON after system
is turned off.
Speaker-level connections have a five-
minute turn-off delay. Check the unit at
a later time.
7
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SPECIFICATIONS
Amplifier power:
Frequency response:
Fuse rating:
100 Watts
20Hz – 120Hz
20A
Max current draw:
Idle current draw:
Input sensitivity:
12A
<800mA
50mV to 4V Line-level input;
1V to 16V universal interface
Crossover frequency:
Crossover slope:
70Hz – 120Hz
12dB
Dimensions (L x W x H):
(includes mounting feet)
16-1/8" x 9-1/2" x 12-1/4"
(410mm x 242mm x 312mm)
Features, specifications and appearance are subject to change without notice.
Declaration of Conformity
We, Harman Consumer International
2, route de Tours
JBL Consumer Products
72500 Chateau-du-Loir
France
250 Crossways Park Drive, Woodbury, NY 11797 USA
© 2004 Harman International Industries, Incorporated
declare in own responsibility that the product
described in this owner’s manual is in compliance
with technical standards:
EN 55013:2001
EN 55020:2002
JBL is a registered trademark, and BassPro is a trademark,
of Harman International Industries, Incorporated.
Part No. BASSPROIIOM3/04
Emmanuel Millot
Harman Consumer International
Chateau-du-Loir, France 3/04
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