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BassPro II is equipped with two line-
level (RCA) inputs and two high-level
inputs. To help you plan the installation
of BassPro II, we have included two 
system application diagrams in
Figures 8 and 9. For more installation
suggestions, contact your local 
authorized JBL car audio dealer.

Splices

(not supplied)

Splices

(not supplied)

Figure 9. Line-level connections with
two outputs (single full range or
subwoofer).

Figure 8. High-level connections.
Connect BassPro II’s high-level
inputs to either the front or rear
speaker outputs of your head unit
(splice crimps not included).

BassPro II 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
Gain Control
Crossover
Remote Bass Control
Auto Turn-On 

POWER LED: This indicator 
will glow red when the BassPro II is
operating.

GAIN CONTROL: Use this 
control to adjust the relative volume
(loudness) of BassPro II with the other
speakers in the vehicle.

CROSSOVER: Use this control to
adjust the amount of high-frequency
information present in BassPro II’s out-
put. A lower value signifies less high-
frequency content.

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 BassPro II 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.

6. If you elect to not install the Remote

Bass Control, adjust the GAIN 
control to the maximum level that
provides undistorted output from the
BassPro II, with the head unit’s vol-
ume control at its 3 o’clock setting.

Note: In most cases the above steps
will provide you with satisfactory
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.

AUTO TURN-ON: For speaker-
level connections, used this switch to
activate (or deactivate) BassPro II’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.

REMOTE BASS CONTROL:
Use this RJ-11 jack to connect the
supplied remote bass control.

1. Make sure the head unit is off and

volume control is set to minimum.

2. On BassPro II’s amplifier panel, set

the Crossover to its maximum 
frequency of 120Hz, as shown in
Figure 10. 

Note: If using the REMOTE BASS
CONTROL, set GAIN to maximum and
set the BASS CONTROL to the
midpoint.

POWER LED 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. 

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 BassPro II.

3. Incorrect GAIN control setting.

Output sounds muddy or distorted. 

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 

Using speaker-level connection: one of 

balance is adjusted to L or R.

the speaker connections is reversed 
(+/–). Reverse one channel.

POWER LED remains ON after system 

Speaker-level connections have a five-

is turned off.

minute turn-off delay. Check the unit at 
a later time.

Amplifier power:

100 Watts

Frequency response:

20Hz – 120Hz

Fuse rating:

20A

Max current draw:

12A

Idle current draw:

<800mA

Input sensitivity:

50mV to 4V Line-level input;
1V to 16V universal interface

Crossover frequency:

70Hz – 120Hz

Crossover slope:

12dB

Dimensions (L x W x H):

16-1/8" x 9-1/2" x 12-1/4" 

(includes mounting feet)

(410mm x 242mmx 312mm) 

Features, specifications and appearance are subject to change without notice.

Declaration of Conformity

We, Harman Consumer International

2, route de Tours
72500 Chateau-du-Loir
FRANCE

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

Emmanuel Millot

Harman Consumer

International

Chateau-du-Loir, France  3/04

JBL Consumer Products  

250 Crossways Park Drive, Woodbury, NY 11797 USA

1.800.336.4JBL (4525) • FAX 1.516.682.3523 • www.jbl.com

© 2004 Harman International Industries, Incorporated

JBL is a registered trademark of 
Harman International Industries, Incorporated.

Part No. BASSPROIIOM3/04