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A302GTI
2 CHANNEL
AUTOMOTIVE AMPLIFIER
TECHNICAL MANUAL
JBL CONSUMER PRODUCTS
250 CROSSWAYS PARK DRIVE, WOODBURY, NY 11797
1-800-336-4JBL(4525) WWW.JBL.COM
2 Channel Automotive Amplifier A302GTI
Controls and connections
Specifications .........................................................1
Parts Lists........................................................
Features .................................................................2
Block Diagrams....................................................1
Test Conditions and Notes ......................................2
Integrated Circuit Diagrams...................................11
Controls and Connections .....................................3
Transistor Diagrams..............................................12
Mounting the amplifier............................................3 Exploded View................................13~15
Packaging
Typical System Configuration (Wiring) ....................4
Schematic Diagrams...................
....................16~18
Printed Circuit Boards (Top View)...............5~6 Amplifier Exploded View........................................19
SPECIFICATIONS
Number of Channels . . . . . . . . . . . . . . . .2 . . .
4 Ohms . . . . . . . . . . . . . . . . . . .150W .
.
2 Ohms . . . . . . . . . . . . . . . . . . . . .
300W
T.H.D. @ 4 Ohms rated Power . . . . . . . . . . . .0.03%
.
Frequency Response . . . . . . . . . . . . . . .10Hz .~ .40KHz
.
Signal to noise Ratio . . . . . . . . . . . . . . 110 dB .
. . . .
Fuse size. . . . . . . . . . . . . . . . . . . 80A
Input Leve Sensitivity. . . . . . . . . . . . . . . 250mV - 4V
Minimum Speaker Impedance . . . . . . . . . . 1ohm .
. .
External Dimensions (Inches)
Length . . . . . . . . . . . . . . . . . . . 14 13/16 .
. . . . . . .
Width . . .
. . . . . . . . . . . . . . . . . 10 3/16.
. . . . . .
Depth . . . . . . . . . . . . . . . . . . . 2 .11/16 .
. . . . . .
External Dimensions (mms)
Length . . . . . . . . . . . . . . . . . . . 376 .
. . . . . . .
Width . . . . . . . . . . . . . . . . . . . 274 .
. . . . . . .
Depth . . . . . . . . . . . . . . . . . . . 67.5 .
. . . . . . .
JBL continually strives to improve its products. New materials, production methods and design refinements are
introduced into existing models without notice as a routine expression of our design philosophy. For this rea
GTI Series Multichannel Automotive Amplifiers may differ in some respects from their published specifications
and descriptions, but will always equal or exceed the original specifications unless otherwise stated.
1
A302GTI 2 Channel Automotive Amplifier
Features
2-Channel Operation
Floating Ground Factory - Head - Unit Speaker - Level input
Variable Input Sensitivity (250mV - 4V)
Fully Complementary Output Stage with Class-AB Voltage Amplification
Gold-plated Power, Input and Output Connectors
2-Ohm Stable (Stereo)
Test Conditions and Notes
All tests to be done, unless otherwise specified, from 10Hz to 40KHz at 14.4V DC into 4 ohm loads and adju
the units gain so that with a .250 volt input signal the unit is at its maximum rated output. All measurem
will be done using an Audio precision system one and the supply voltage.
An B+ line voltage of 14.4V DC shall be applied to the unit under test for all measurements unless otherwi
specified. The voltage applied to the unit shall be measured at the power connection on the Amplifier.
Signal Source
Unless otherwise specified, all tests shall be conducted with the Audio Signal Generator output configured
be balanced, less than or equal to 50 ohm source impedance, and floating. The signal source "GND" shall be
connected to the Amplifier PWR GND at the Amplifier.
Output Load
Unless otherwise specified, all tests shall be conducted with 4 ohm resistive loads having less than 10%
reactive components at any frequency below 75KHz. Each resistor shall have a value that remains within 1%
while dissipating the rated output of the unit under test.
Power Indicator LED steadily illuminates for normal operation. LED blinks when
protection circuitry is engaged, and during power up.
2
2 Channel Automotive Amplifier A302GTI
Controls and Connections
R
INPUT HPF LPF
LEVEL FREQ FREQ
ST BR . . . . HPF FLAT LPF . .
4V 250mV 40Hz 400Hz 40Hz 400Hz
REMOTE
L
A302GTI
X-OVER FREQUENCY
1 8 5 7 9 6
FUSE 20Ax3
- + - +
+BATT REM GND +BATT GND
SPEAKER OUTPUTS
POWER CAPTAP
2 3
4
10
Controls and Connections
5. Input-Level Control - Adjusts input sensitivity
1. Preamp-Level Input Connector - Connects to for pre-amp level and speaker level inputs.
line-level output from the source unit.
6. The electronic crossover is a 24dB/oct.
Low pass filter which can be Set at any frequency
2. Speaker Output Connector - Connect speaker between 40Hz and 400Hz.
wiring to these connectors. See wiring instruc-
7. The electronic crossover is a 24dB/oct.
tions on page 4 for more information. High pass filter which can be Set at any frequency
between 40Hz and 400Hz.
3. Fuse - Three 20 Amp ATC type Fuses. 8. Stereo and bridged selector switch.
9. Crossover selector switch-Low pass filter (LPF),
4. Power Connection for 12V+, GND and REM High pass filter (HPF) or it may be defeated (FLAT).
connections for power wires. See wiring instruc- 10. External Capacitor(Optional)
tions on page 4 for more information.
Mounting the Amplifier
The JBL GTI Series amplifiers can be mounted in virtually any location inside the vehicle.
However, make sure to keep the amplifier away from heater vents or ducts.
1. At the chosen site, use the amplifier as a mounting template and mark the locations of the
four mounting holes.
2. Drill a small pilot hole at each marked location.
3. Mount the amplifier and securely tighten the mounting screws.
3
A302GTI 2 Channel Automotive Amplifier
Typical System Configuration
Cassette/CD Tuner
(Head Unit)
CD Player or Changer
Antenna Input
Power
Antenna
Cassette/Receiver
Power Supply
Wires
Amplifier
Power
Connection
Power
Antenna Line
Fuse
Fuse
Relay Level
Input
Black - Power Ground
Antenna Motor Ground
Red - Main +12V
Remote Antenna
Remote On/Off
Power Supply
Black Power
Remote On/Off
Ignition
Switch
60 Amp (Not Included)
Main +12V
Fuse
Power Ground
Vehicle Battery
Speakers
Chassis Ground
4
2 Channel Automotive Amplifier A302GTI
Printed Circuit Board (Top View)
1 1 1
KTU-9214A KTU-9213A KTU-9227A
1SS133 1SS133
D15 D14 TER01
1SS133 1SS133 Y-FH9402 Y-FH9402 Y-FH9402
330/1W
D16 D17
TER03
R258
102(M) R158
J01
33KF TER02 100/25"SXE"
10KF
680/2W FH02 FH01
R60 C71 680/2W
FH03
100KF 55m/m C31
10/50V 104(M) J03
4.7/0.5W
4.7/0.5W
R59 C72 C222 104(M) R157 BAR25 55m/m 104P
R257 C122
J06 C30
330/1W
R62
104P J02
BAR25
R58
C165
J08 J07
R57
BAR25 BAR25 1N5404
50N06
100
GREEN/BLACK/RED
100
D06
R35 CL-200C R41 1K 3P R38
CL-200C
50N06
10/16V
1N4002 D01
4.7/0.5W
4.7/0.5W
2.2K L01
CON01 C01 R01
R27
Q37 A1266GR 4.7K
100/16V
Q35 10K
104(M)
10K
R02 Q16
L201
1SS133 D33
L101
R04
R256 C09 A1266GR C3198GR
104P
R156
C3198GR
104P Q10 C10
R42 1K C36
Q01
CL-300
Q06
C04 A1266GR 47K 4.7KF
4.7K
C11
50N06
1.2K C3198BL
Q02 R25 R66
R29
Q38 A1266GR
100
100
6.8K 10.5KF
W
R13
Q03 2200/25V"RX"
RE
R26
R39 1SS133 D34 R03 10K A1023Y
51K R65
1K R19
SC
R14
430K
R07 Q09
22/16V
C53
15KF R70
50N06
C3198GR 1SS133 10 C39 R73
Q05 R05
104P
D02
12.5KF R71 2.2/1W
CL-300
1.2K
Q31 47/16V 1K R28
47/16V Q11
R15 C03 C02 R21
50N06
SUPPORT 15K
10/25V
680 A1266GR
100
Q07
100
R06 R11
C05 102(M) R20
R40 10K 100/16V C07 1SS133 D03
50N06
L02 C28
TL494CN
W
2200/25V"RX" R16
22K R22 1K
2200/25V"RX"
RE
33K
C51
R09 R12