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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
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        CL-300
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    4.7K
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         C11
                                           50N06




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                                                                                                                                                                                                                                                                                                                                                                                                     Q02            R25      R66
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    R29
                                                                                                                                                                                                                                                                     Q38 A1266GR
                                                              100




                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               100
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                                                                      R39                                                                                                                                                                                           1SS133 D34                                                                                                                      R03 10K                                                                           A1023Y
                                                                                                                                                                                                                                                                                                             51K                                                                                                             R65
                                                                                                                                                                                                                                                                                                                                                                           1K                                                                                                                                                                                                                                         R19
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                                                                                                                                                                                                                                                                                                        R14
                                                                                                                                                                                                                                                                                                                                                                                                                         430K
                                                                                                                                                                                                                                                                                                                                                                      R07                                                                                                           Q09
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                                                                                                      C53




                                                                                                                                                                                                                                                                      15KF R70




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                                                                                                                        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




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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               W
                                                                                                            2200/25V"RX"                                                                                                                                                                                         R16
                                                                                                                                                                                                                                                                                                                                                                                                             22K                                                       R22   1K
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          2200/25V"RX"




                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           RE
                                                                                                                                                                                                                                                                                                                                                                               33K
                                                                                              C51




                                                                                                                                                                                                                                                                                                                                                                                          R09            R12




                                                                                                                                                                                                                                                                                                                                                                                                        



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