BassPro™II
Powered Subw oofer
SERVICE MANUAL
JBL Consumer Products
250 Crossways Park Dr.
Woodbury, New York 11797 Rev0 6/2003
BassPro II
CONTENTS
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . .. . . . . . . . . .. . . . . . . 1
DETAILED SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . ………….. . . . . . . . . . 2
CONNECTIONS . . . . . . . . . . . . . .. . . . . . . . . . . . . . .. . . . . . . . . . .. . . . . . . . . . 3
CONTROLS & FUNCTIONS. . . . . . . . . . . . . .. . . . . . . . . . . . . . . .. . . . . . . . . . . 5
BASIC TROUBLESHOOTING. . . . . . . . . . . . . .. . . . . . . . . . . . . . ... . . . . . . . . . 6
REMOTE LEVEL CONTROL. . . . . . . . . . . . . .. . . . . . . . . . . . . . . .. . . . . .. . . . . 7
EXPLODED VIEW. . . . . . . . . . . . . . . . .. . . .. …… . . . .. . . . .. . .. .. . . . . …... … . 8
BLOCK DIAGRAM . . . . . . . . . . . . . .. . . . . . . ……... . . . . . . .. . .. . . . . . . . …... 9
PCB DRAWINGS. …………… . . . . ………………………………………………. . 10
ELECTRICAL PARTS LIST …………. .... . .. …. . . . .……….. . . . . . .. .. . . . . . . 13
IC – TRANSISTOR PINOUTS . … . . .. . . . …. . . …….…………... . …. . . . . . . . 15
SCHEMATIC DIAGRAM.. . . . . . . . . .. .. .. .. . . ….. .. . ….………... . . . . . . . . . . .16
PACKING ………………. . . . . .. . . . . . . . .. .. . …… . .. .. . . . . . . . . … . . . . . . . . 17
BASS PRO II BASIC SPECIFICATIONS
Ampli fier pow er : 100 Watts
Frequency response: 20Hz – 120Hz
Fuse rating: 20A
Max curr ent draw : 12A
Idle current draw: <800mA
Input sensitivity: 50mV to 4V Line-level input; 1V to 16V universal interface
Crossover fr equency: 70Hz – 120Hz
Crossover sl op e: 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)
JBL continually strives to update and improve existing product s, as well as create new ones. The specific ations and
details in this and related JBL publications are theref ore subjec t to change without notice.
BassPro II
BASSPROII AUTO SUBWOOFER SPECIFICATIONS
GENERAL CONDITIONS: TEST INPUT SIGNAL FOR LINE IN – 2CH/60Hz/250mV.
TEST OUTPUT – 1 W ATT 4 Ohms LOAD (Bridge).
POWER SOURCE DC14.4V/12A min
TEST CONDITIONS: ALL TEST SIGNALS FROM LINE IN UNLESS OTHER REMARKS.
CROSSOVER VR AT MAX POSITION UNLESS OTHER REMARKS.
UNIT NOMINAL LIMIT
1. TOTAL OUTPUT POWER W 100
2. OUTPUT POWER (1 CHANNEL)
(60, 400; 5.0% THD)
W 22 20
3. THD AT 1.0W (60,250;)
4. SIGNAL TO NOISE RATIO
(60,250; O/P=1W;)
5. FREQUENCY RESPONSE
(-- , 250; O/P=1W)
180Hz -6.5+/-3
6. CROSSOVER RANGE
(120,250,O/P=1W,MAX REF)
7. CROSSOVER SLOPE dB 12
8. INPUT SENSITIVITY
(60, --;O/P=18W,L+R, GAIN MAX)
(60, --;O/P=18W, 2CH,GAIN MAX)
9. MAX GAIN NOISE, GAIN MAX )
10. MIN GAIN NOISE, GAIN MIN )
MAX TO MIN dB -12+/-3
LOW – INPUT
% 0.3 0.5 MAX
dB 70 65 MIN
(60-120HZ) dB 60Hz 0REF
120Hz -1.6+/-3
mV 340 +/- 60
HI – INPUT
mV 0.8 1.5 MAX
mV 0.5 0.9 MAX
V 3.5 +/- 0.6
11. AUTO SENSE
(--, --, HI-N, 1CH)
12. PROTECTION CIRCUIT
(60,250,O/P=10W)
13. FUSE RATING A 20
14. MAXIMUM CURRENT DRAW A 12
15. IDLE CURRENT DRAW mA <800
16. DIMENSIONS
AUTO ON LEVEL V 1.8
AUTO OFF TIME MIN 3.0 +/- 1.5
SHORT SPK TERMINAL +/- Functional
16 1/8 X 9 ½ X 12 ¼”
(410 X 242 X 312MM)
+/- 0.5
POWER CONNECTIONS
Connecting power to BassProII is
shown in
Figure 7. Please observe
the following installation tips:
When using the high-level input connections, BassProII will automatically
turn on when you turn on your radio.
In this case, the remote (REM) connection is not needed. Use at least #20
AWG speaker wire for speaker-level
input connections.
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.
Connect BassProII’s “BATT +12V”
terminal directly to the battery’s positive (+) terminal. Install a fuse holder,
with a 20A fuse, within 18" of the battery’s positive (+) terminal.
BassPro
(right-side panel)
Chassis Ground
(Bare Metal)
Source Unit
Battery
Fuse 20 A
18"
Remote
Turn-On
Route all power wires through a grommet 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.
Figure 7.
Chassis Ground
(Bare Metal)
Battery
Source Unit
Remote
Turn-On
Fuse 20A
18"
BassProII Connection Panel
BassPro II
APPLICATIONS
BassProII is equipped with two linelevel (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
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 BassProII’s high-level
inputs to either the front or rear
speaker outputs of your head unit
(splice crimps not included).
BassProII
Connection Panel
Subwoofer Level Control
BassProII
Connection Panel
Subwoofer Level Control
Left Speaker
Right Speaker
Source Unit
Source Unit
LF Speaker
RF Speaker
LR Speaker RR Speaker
RCA Stereo Cables
(not supplied)
BassPro II
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
Gain Control
Crossover
Remote Bass Control
Auto Turn-On
POWER LED: This indicator
will glow red when the BassProII
is operating.
GAIN CONTROL: Use this
control to adjust the relative volume
(loudness) of BassProII with the other
speakers in the vehicle.
CROSSOVER: Use this control
to adjust the amount of high-frequency
information present in BassProII’s output. A lower value signifies less highfrequency 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 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.
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.
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 speakerlevel 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.
REMOTE BASS
CONTROL: Use this RJ-11 jack
to connect the supplied remote bass
control.
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: If using the REMOTE BASS
CONTROL, set GAIN to maximum
and set the BASS CONTROL to the
midpoint.
Figure 10.
BassPro II