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5

Left +: White
Left –: White with black stripe
Right +: Gray
Right –: Gray with black stripe

3. If you are connecting your Decade

Series amplifier to a source unit with
output voltage higher than 4V, connect
the output signal wires of the source
unit to the floating ground factory head
unit inputs.

Electronic Crossover
The electronic crossover in your Decade
Series amplifier (DA4002, DA6502 and
DA3504) can be selected as a 12dB/oct.
high-pass filter (HP) at 120Hz or a low-
pass filter (LP) at 80Hz, or defeated
(FLAT). The electronic crossover in the
DA1002 is a low-pass filter at 70Hz or
100Hz, and may be defeated.

Setting Input Sensitivity
Proper input sensitivity control settings
on Decade Series power amplifiers are
critical to ensure optimum performance,
low noise levels and maximum system
reliability. As a general rule, controls at
the front end of a system (source, equali-
zers and other processors) should be set
as high as possible with the amplifier
input sensitivity set as low as possible
while still providing adequate volume
levels. Using a high signal level and a low
sensitivity setting will help keep backgro-
und noise in the system to a
minimum.

Initially, turn the input sensitivity GAIN
control to its minimum (counter-clockwi-
se) position.
1. Reconnect the (–) negative lead to your

vehicle’s battery. Apply power to the
audio system and play a favorite music
track from a CD or tape. (Note: After the
source unit is on, the JBL badge (on the
top panel) will illuminate, indicating the
amplifier is on. If not, check the wiring,
especially the remote connection from
the source unit. Also refer to
“Troubleshooting” on page 7.)

2. On the source unit, increase the volume

control until it is approximately 3/4 of its
maximum output level. Slowly increase
the Input Sensitivity control (clockwise)
toward three o’ clock and, at the same
time, listen to the quality of the reprodu-
ced sound. 

At some point, you’ll hear distortion on

the music peaks. Stop the adjustment
and turn it back slightly. This is the
maximum undistorted output level of
your system, and should not be excee-
ded during use. 

3. After adjusting the level of the main

speakers in your system, you should
adjust the remaining channels (if you
are using a DA3504 or a multi-amp 
system) for the desired system balance.
You’ll find this easiest to do by adjus-
ting the channels in the following order:
1) front speakers, 2) rear speakers, 3)
subwoofer. Elaborate, multi-channel
systems may be too complex to adjust.
Your local JBL installation specialist is
the best person to help with such adjus-
tments.

 35633_Decade DA 4002, Eng  04/11/98  11:02  Side 5

For your convenience, we’ve included
several application diagrams to help you
plan your own system installation.
Figures 1 through 4 show how to configu-
re the Decade Series power amplifiers for
stereo, bridged-mono and tri-mode ope-
ration. 

(Note: For simplicity, figures do not show
power, remote and input connections.)

Figure 1. This wiring diagram shows a
DA4002, DA6502 amplifier set to stereo to
drive a pair of full-range speakers.
Figure 2. This wiring diagram shows a
DA1002 amplifier set to bridge mode
(mono) to drive a single subwoofer.
Figure 3. This wiring diagram shows a
DA4002, DA6502 amplifier set for tri-
mode operation. For a desired crossover
frequency, use the chart on page 4 to
select an inductor for the subwoofer, and
corresponding capacitors for left and
right speakers.
Figure 4. This wiring diagram shows a
DA3504 set to drive a pair of 5-1/4" 
2-way speakers with the two front 
channels, and the rear channels set
to drive a single subwoofer in bridge
mode.

6

+

–

+

–

+

–

–

+

15

+

–

+

–

+

–

–

+

20

+

–

–

+

+
+

–

–

+

–

–

+

20

20

+

+

–

–

+

–

+

–

+

–

+

–

+

–

+

–

+

–

+

–

+

–

+

–

–

+

30

+

–

+

–

–

–

+

–

 35633_Decade DA 4002, Eng  04/11/98  11:02  Side 6

7

No audio

Low/no remote on voltage

Check connections; test turn-on voltage

Speakers are not connected 

Check wiring; use VOM/DVM to measure speaker coil 

or are blown

resistance

Distorted audio

Input sensitivity is not set properly

See Setting Input Sensitivity on page 5

Audio lacks “punch”

Speakers are wired with 

Check polarity of connections; refer to Applications

wrong polarity

Audio cycles off and on;

A protection circuit is turning 

Verify the following: electrical system is between

amber protection LED

amplifier off and on

5 ~ 18 Vdc; temperature is not over 194°F (90°C); 

(JBL badge on top panel)

no short circuits; speaker loads are not less than 2 ohms

flashes

(4 ohms in mono)

Audio cycles off and on;

GAIN is set too high

Set Input Sensitivity correctly (see page 5)

Amber protection LED
(JBL badge on top panel) flashes

Fuse blows

Incorrect wiring or

Check connections; refer to Applications

short circuit

Declaration of Conformity

Kongevejen 194B 
DK-3460 Birkerød
DENMARK

declare in own responsibility, that the products  

  described

in this owner’s manual are in compliance with technical

 

standard:

EN 55 020/6.1988

Steen Michaelsen

Birkerød. DENMARK. 3/98

Use the following guide to identify symp-
toms and solve problems. Make sure the
vehicle’s electrical system is working pro-
perly and power is reaching the amplifie-
r’s power connector.

EN 55 013/A12/8. 1994

EN 55 020/12. 1994

Steen Michaelsen

Birkerød, DENMARK 07/98

 35633_Decade DA 4002, Eng  04/11/98  11:02  Side 7

JBL Consumer Products
250 Crossways Park Drive
Woodbury, NY 11797
www.jbl.com

Part No. DECAMPOM
Made in DK

Power Output, 4 ohms:

2 x 40 watts

2 x 65 watts

4 x 35 watts

2 x 100 watts

Power Output, 2 ohms:

2 x 50 watts

2 x 75 watts

4 x 50 watts

2 x 150 watts

Power Output, Bridged 4 ohms:

100 watts

150 watts

2 x 100 watts

300 watts

Frequency Response:

20Hz ~ 20kHz +1dB, –2dB

20Hz ~ 20kHz +1dB, –2dB

2 Hz ~ 20kHz +1dB, –2dB

20Hz ~ 20kHz +1dB, –2dB

Input Sensitivity:

250 mV ~ 4V

250 mV ~ 4V

250 mV ~ 4V

250 mV ~ 4V

THD + Noise (4 ohms):

0.1 %

0.1 %

0.1 %

0.1 %

Signal-to-Noise:

>90dB

>90dB

>90dB

>90dB

Maximum Current Draw:

18A

14A

34A

32A

Dimensions (W x H x L):

9-5/8" x 2-1/4" x 8-1/4"

9-5/8" x 2-1/4" x 9-3/4"

11-5/8" x 2-9/16" x 11-7/8"

11-5/8" x 2-9/16" x 11-5/16"

244 x 57 x 210mm

244 x 57 x 248mm

295 x 65 x 300mm

295 x 65 x 290mm

 35633_Decade DA 4002, Eng  04/11/98  11:02  Side 8