JBL GT-5-A-3001 Service manual
GT5-A3001
1 CHANNEL POWER AMPLIFIER
SERVICE MANUAL
Released 2007
Discontinued XXXX
JBL Consumer Products
250 Crossways Park Dr.
Woodbury, New York 11797 Rev0 3/2008
1
GT5-A3001
- CONTENTS -
SPECIFICATIONS ………………………………………..1
PACKING……………………………………………..…....2
CONTROL/INSTALLATION DRAWINGS………………3
CONTROL/INSTALLATION INSTRUCTIONS………....4
BASIC TROUBLESHOOTING……………………………5
EXPLODED VIEW/PARTS LIST…….….….…………....6
AMPLIFIER BLOCK DIAGRAM…………………….……7
ELECTRICAL PARTS LIST ..……….……….…….…….8
P.C.B. DRAWINGS….………………………...…….……11
IC/TRANSISTOR PINOUTS..…………………….….…..13
SCHEMATICS……………..……………….………..…...14
GT5-A3001 Specifications
Output Power: 175W RMS x1 channels @ 4 ohms; ≤1% THD + N
(14.4V supply) 225W RMS x 1 channels @ 2 ohms; ≤1% THD + N
300W RMS x 1 channel @ 1 ohm; ≤1% THD + N
Signal-to-noise ratio: 95dBA (reference 1W into 4 ohms)
120dBA (reference rated power into 4 ohms)
Total Peak power: 600W
Frequency response: 10Hz – 300Hz (–3dB)
THD+N 1KHz LPF=22KHz ≤0.05% (rated power @ 4 ohms)
Input Impedance 10kΩ
Maximum input signal: 6.0V
Maximum sensitivity: 200mV
Hi-Pass, Low Pass X-over Limits 32Hz – 320Hz ±20% 12dB/oct
DC Offset <30mV
Output regulation: 46dB
Idle Current @ 4 ohms 400mA
Max Current Draw ≤20A
Remote Operating Voltage 5V
Turn-on delay time 3 sec
Circuit Protection Temperature (85±5C), Short circuit, Operating voltage range (8-16V)
Dimensions: 2 1/8 x 9 1/4 x 12" (54 x 235 x 305mm)
Fuse: 2 x 20A
JBL continually strives to update and improve existing products, as well as create new ones. The specifications and details in
this and related JBL publications are therefore subject to change without notice.
2
GT5-A3001
ABCD
A
2x
4x
1x
9-1/4"
235mm
2-1/8"
54mm
12"
305mm
3
GT5-A3001
Factory Bolt Ring Connector
G
round Wire
Note: Remove any paint
below ring connector.
Star Washer
4
GT5-A3001
GT5-A3001 CAR AUDIO SUBWOOFER AMPLIFIER OWNER’S MANUAL
Installation Warnings and Tips
• Disconnect the negative (–) lead from your vehicle’s
battery.
• At the installation sites, locate and make a note of
all fuel lines, hydraulic brake lines, vacuum lines
and electrical wiring. Use extreme caution when
cutting or drilling in and around these areas.
• Choose a safe mounting location away from moisture.
• Make sure there is sufficient air circulation at the
mounting location for the amplifier to cool itself.
• Mount the amplifier, using the supplied hardware.
Specifications
• 175W RMS x 1 channel @ 4 ohms and ≤1% THD + N*
• 225W RMS x 1 channel @ 2 ohms, 14.4V supply and
≤1% THD + N*
• 300W RMS x 1 channel @ 1 ohm, 14.4V supply and
≤1% THD + N*
• THD + N: 0.05% (rated power @ 4 ohms)*
• Signal-to-noise ratio: 95dBA
(reference 1W into 4 ohms)*
• Signal-to-noise ratio: 120dBA
(reference rated power into 4 ohms)
• Frequency response: 10Hz – 300Hz (–3dB)*
• Total peak power: 600 watts
* CEA-2006A-compliant
0
Speaker Output Connectors
• Connect the subwoofer to these terminals,
observing proper polarity. Either + or –
terminal may be used. Minimum total
impedance is 1 ohm.
1
Fuses
• Replace only with the same type and rating.
2
Power Input Connectors
• +12V: Connect to the positive terminal of the
vehicle’s battery. 8 AWG wire is recommended.
Install an appropriate fuse holder and fuse (40A
minimum) within 18 inches of the battery. Make
sure the wire is not damaged or pinched during
installation. Install protective grommets when
routing wires through the firewall or other sheet
metal.
• GND: Connect to the vehicle’s chassis. Refer to
the picture below.
• REM: Connect to the “Remote Out” lead from
the source unit or to a source of switched
12V+ (ACC).
3
Aux Output Connectors (RCA)
• Nonfiltered pass-through output. Connect to
the input of an additional amplifier.
4
Input Connectors (RCA)
• Connect to the RCA outputs from the source unit
or signal processor.
5
Input-Level Control
• Used to match the input level of the amplifier
to the output level of the source unit.
• See 9for the adjustment procedure.
6
Protect LED
• Illuminated under any of the following fault
conditions: battery over/under voltage, short
circuit in speaker wires, amplifier is too hot,
amplifier’s output circuit has failed (DC voltage
is present in the amplifier’s output).
7
Low-Pass Filter Frequency Control
• 12dB/octave low-pass filter,
variable from 32Hz to 320Hz.
• See Afor the adjustment procedure.
8
Power On LED
• Illuminated when the amplifier is on.
9
Setting Input Level
A Turn Input Level control counterclockwise to
6V (minimim).
B With a dynamic music track playing, turn the
head unit’s volume control to the 3/4 position.
C Turn Input Level control clockwise until the
bass output is proportionate to the output of
the high-frequency speakers, according to
your preference.
D Input level is now adjusted correctly.
A
Setting the Crossover
A Crossover setting for subwoofers.
Note: Acceptable frequency ranges are indicated
in gray.
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