Read JBL GTO 4000 (serv.man2) Service Manual online
4 CHANNEL
POWER AMPLIFIER
TECHNICAL MANUAL
GTO 4000
JBL CONSUMER PRODUCTS
250 CROSSWAYS PARK DRIVE, WOODBURY, NY 11797
8500 BALBOA BOULEVARD, NORTHRIDGE, CA91329
WWW.JBL.COM
250 CROSSWAYS PARK DRIVE, WOODBURY, NY 11797
8500 BALBOA BOULEVARD, NORTHRIDGE, CA91329
WWW.JBL.COM
-13 dB
-13 dB
-3 dB
+3 dB
0 dB
-8 dB
-3 dB
+3 dB
0 dB
-8 dB
-13 dB
-13 dB
4/3/2 Channel Power Amplifier
GTO 4000
SPECIFICATIONS
Specifications ..........................................................1
Features ..................................................................2
Test Conditions and Notes .........................................2
Controls and Connections .........................................3
Features ..................................................................2
Test Conditions and Notes .........................................2
Controls and Connections .........................................3
Typical System Configuration (Wiring) .........................4
Printed Circuit Boards(Top View).............................5~6
Printed Circuit Boards(Top View).............................5~6
Parts Lists......................................................7~9
Block Diagrams..................................................10
Packaging Exploded View....................................11
Integrated Circuit Diagrams..................................12
Transistor Diagrams......................................13~14
Schematic Diagrams......................................15~18
Amplifier Exploded View.....................................19
Block Diagrams..................................................10
Packaging Exploded View....................................11
Integrated Circuit Diagrams..................................12
Transistor Diagrams......................................13~14
Schematic Diagrams......................................15~18
Amplifier Exploded View.....................................19
Number of Channels . . . . . . . . . . . . . . . . . . . . . .
RMS Bridged Power Output ,4 Ohm . . . . . . . . . . . . . . . . . . . . . . .
SNR (A - weighted) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RMS Power Output,2 Ohm . . . . . . . . . . . . . . . . . . . . . . . . . . .
RMS Power Output,4 Ohm . . . . . . . . . . . . . . . . . . . . . . . . . . .
THD@Rated Output. . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
THD@Rated Output. . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Output max . . . . . . . . . . . . . . . . . . . . . . . .
Active crossover(cont.var.) . . . . . . . . . . . . . . . . . .
Crossover settings . . . . . . . . . . . . . . . . . . . . . .
Crossover slope . . . . . . . . . . . . . . . . . . . . . . .
4
30-320Hz
12dB/OCT
LP/HP/OFF
1
4 Channel Power Amplifier
Controls and connections
Input sensitivity. . . . . . . . . . . . . . . . . . . . . . . . .
Bass Boost . . . . . . . . . . . . . . . . . . . . . .
100mV-4V
450W
200W
4 x 75W
4 x 50W
0.10%
>92dB
4 x 75W
4 x 50W
0.10%
>92dB
10Hz-40kHz
+6dB@45Hz
Length . . . . . . . . . . . . . . . . . . . . . . . . . . .
Width . . . . . . . . . . . . . . . . . . . . . . . . . . .
Depth . . . . . . . . . . . . . . . . . . . . . . . . . . .
Length . . . . . . . . . . . . . . . . . . . . . . . . . . .
Width . . . . . . . . . . . . . . . . . . . . . . . . . . .
Depth . . . . . . . . . . . . . . . . . . . . . . . . . . .
13 3/8
9 3/8
2 1/16
340
238
52
External Dimensions (Inches)
External Dimensions (mms)
Gto 4000
Test Conditions and Notes
All tests to be done, unless otherwise specified, from 30Hz to 320Hz at 14.4V DC into 2 ohm loads and adjust
the units gain so that with a .100 volt input signal the unit is at its maximum rated output. All measurements
will be done using an Audio precision system one and the supply voltage.
the units gain so that with a .100 volt input signal the unit is at its maximum rated output. All measurements
will be done using an Audio precision system one and the supply voltage.
An A+ line voltage of 14.4V DC shall be applied to the unit under test for all measurements unless otherwise
specified. The voltage applied to the unit shall be measured at the power connection on the Amplifier.
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 to
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.
Unless otherwise specified, all tests shall be conducted with the Audio Signal Generator output configured to
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 2 ohm resistive loads having less than 0.1%
reactive components at any frequency below 1Kz. Each resistor shall have a value that remains Within 0.1%
while dissipating the rated output of the unit under test.
Unless otherwise specified, all tests shall be conducted with 2 ohm resistive loads having less than 0.1%
reactive components at any frequency below 1Kz. Each resistor shall have a value that remains Within 0.1%
while dissipating the rated output of the unit under test.
Power Indicator LED steadily illuminates for normal operation.
RCA-jacks, Speaker-and power terminals gold-plated
2 ohm stability(stereo mode)
Bridging capability(min.4 ohm)
Tri-mode operation(min.4 ohm)
Protection circuitry thermal-and electrical overload.short-circuit.DC-offset
HPF variable high pass filter(HPF)30-320Hz.12dB/oct.
LPF variable low pass filter(LPF)30-320Hz.12dB/oct.
+6dB(at 45HZ) Bass boost (only REAR channel)
2
Features
4 Channel Power Amplifier
Gto 4000
Controls and Connections
Controls and Connections
1. Low INPUT (RCA JACK TYPE)
- Connection to line of level output from the
source unint
2. Power Indicator
3. Input-sensitivity level coltrol
5.+6dB(at45Hz)Bass boost
4. Low/High pass filter which can be set at
any fequency between 30Hz and 320Hz(adjustable)
6.Power Connector-Connection +12V for,
GND and REM in or out.
7.Fuse / 25A attached type
8.Output Connector - connect a wire between
the output terminal on the amp and Speakers
(each channels)
3
1
1
8
7
6
3
3
2
4
4
5
4 Channel Power Amplifier
Gto 4000
X-OVER
REAR
BASS EQ
ON
OFF
OFF
HP
LP
320Hz
30Hz
GAIN
INPUT
L
R
POWER
30Hz
320Hz
HP
LP
OFF
X-OVER
FRONT
GAIN
INPUT
L
R
REAR
FRONT
+ R - + L -
FUSE
+12V
REM
GND