JBL GTS 600 (serv.man2) User Manual / Operation Manual ▷ View online
components is extremely
important for proper performance
and long term reliability.
All wiring connections should be
made either by soldering with
heatshrink tubing insulation or
with high quality crimp type
insulated connectors installed with
a good crimping tool. Soldering
crimp connections is recom-
mended to further enhance
connection reliability. Never use
wire-nuts, insulation-displacement
connectors (i.e. ScotchLok type), or
“twist and tape” connections. Do
not use electrical tape; it will
important for proper performance
and long term reliability.
All wiring connections should be
made either by soldering with
heatshrink tubing insulation or
with high quality crimp type
insulated connectors installed with
a good crimping tool. Soldering
crimp connections is recom-
mended to further enhance
connection reliability. Never use
wire-nuts, insulation-displacement
connectors (i.e. ScotchLok type), or
“twist and tape” connections. Do
not use electrical tape; it will
loosen with age and extreme
temperatures. Never leave bare
wire exposed.
Route the wiring through the car
carefully. Do not allow wires to lay
against sharp sheet metal edges or
any other surfaces that might wear
away or cut through the insulation
of the wire. Use insulated strain
reliefs, rubber grommets and
plastic tubing to protect the wires
whenever they are run through
sheet metal panels or are placed
where they might be pulled or
damaged.
temperatures. Never leave bare
wire exposed.
Route the wiring through the car
carefully. Do not allow wires to lay
against sharp sheet metal edges or
any other surfaces that might wear
away or cut through the insulation
of the wire. Use insulated strain
reliefs, rubber grommets and
plastic tubing to protect the wires
whenever they are run through
sheet metal panels or are placed
where they might be pulled or
damaged.
5
Cassette/CD Tuner
CD Player
or Changer
CD Input
Cassette/CD Preamp Output
Antenna Input
Power
Antenna
Antenna
Power
Antenna
Relay
Blue w/White Stripe - Remote On/Off
Main +12V
Power Ground
Chassis Ground
Vehicle Battery
–
+
Ignition Switch
Antenna
Motor
Power
Supply
Blue (Blue/White)
Remote On/Off
Remote Antenna
Black - Power Ground
Red - Main +12V
Yellow - Back Up Power
Speakers
+
–
+
Fuse
Fuse
Fuse
Cassette/Receiver
Power Supply
Wires
GTS300 – 40 Amp
GTS600 – 80 Amp
GTS600 – 80 Amp
(Not Included)
Amplifier
Power
Connection
Amplifier
Speaker
Output
Connection
Speaker
Output
Connection
Amplifier
Speaker
Level
Input
Line
Input
Cassette/CD Tuner
Speaker Level Output Connection
(Use only when line level ouput
is not available)
Speaker Level Output Connection
(Use only when line level ouput
is not available)
POWER
M
A D
E I N T H E
U S
A
Speaker-Level Input
Impedance Adjustments
Impedance Adjustments
The speaker level inputs of the
GTS300 and GTS600 come factory
set with 100K ohm input impe-
dance. This will provide the lowest
distortion operation from the
speaker outputs of most modern
head units by reducing the power
the amplifier in the head unit must
deliver to practically nothing.
On some older, or lowerpriced
head units, this load will not
facilitate proper fader operation.
To provide for this, we have
provided the ability to change the
input impedance of the speaker-
level inputs to 15 ohms. This is
accomplished by connecting the
jumpers as shown in the diagram
below.
GTS300 and GTS600 come factory
set with 100K ohm input impe-
dance. This will provide the lowest
distortion operation from the
speaker outputs of most modern
head units by reducing the power
the amplifier in the head unit must
deliver to practically nothing.
On some older, or lowerpriced
head units, this load will not
facilitate proper fader operation.
To provide for this, we have
provided the ability to change the
input impedance of the speaker-
level inputs to 15 ohms. This is
accomplished by connecting the
jumpers as shown in the diagram
below.
• If the head unit has 4 channels of
builtin amplification and/or an
electronic fader control, you
should leave the jumpers in the
factory set position.
electronic fader control, you
should leave the jumpers in the
factory set position.
• If the head unit has 2 channels of
amplification, with a speaker-
level fader, the jumpers should
be set to the 15-ohm position.
This will always be a rotary-type
control, not one controlled by
elecronic pushbuttons.
level fader, the jumpers should
be set to the 15-ohm position.
This will always be a rotary-type
control, not one controlled by
elecronic pushbuttons.
Crossover Frequency
Adjustments
Adjustments
The GTS300 and GTS600 ampli-
fiers include built-in frequency
selectable crossovers. One
crossover is connected in series
with the amplifier circuitry and the
other crossover is connected to the
preamp level output jacks. These
crossovers can be set in either the
“flat” (full bandwidth operation),
Low Pass (Subwoofer operation),
or High Pass (satellite operation).
• The crossover frequencies are
fiers include built-in frequency
selectable crossovers. One
crossover is connected in series
with the amplifier circuitry and the
other crossover is connected to the
preamp level output jacks. These
crossovers can be set in either the
“flat” (full bandwidth operation),
Low Pass (Subwoofer operation),
or High Pass (satellite operation).
• The crossover frequencies are
set by “chips” inside the
amplifier. These “chips” are
simply a set of resistors,
connected across the pins and
molded into a single package.
The crossover frequencies may
be changed to any value desired
by changing the resistor
network. JBL has “chips”
available in the popular values
listed in the table below. If none
of these suit your system, you
may pruchase compatible
resistor networks from a local
electronics store, or you may
build you own custom values
from discrete resistors mounted
on a 14-pin “DIP Header” using
the instructions which follow.
amplifier. These “chips” are
simply a set of resistors,
connected across the pins and
molded into a single package.
The crossover frequencies may
be changed to any value desired
by changing the resistor
network. JBL has “chips”
available in the popular values
listed in the table below. If none
of these suit your system, you
may pruchase compatible
resistor networks from a local
electronics store, or you may
build you own custom values
from discrete resistors mounted
on a 14-pin “DIP Header” using
the instructions which follow.
Frequency Resistor JBL Part
Value
Number
50 Hz
47 K
GTM 50
80 Hz
33 K
GTM 80
120 Hz
20 K
GTM 120
200 Hz
12 K
GTM 200
250 Hz
10 K
GTM 250
500 Hz
4.7 K
GTM 500
2.5 Hz
1 K
GTM 2500
5 Hz
470
GTM 5000
6
40
BALANCED
INPUTS
SPEAKER
INPUT
IMPEDANCE
SELECTOR
LEFT
ZIN
SEL
100K
15 OHM
100K
15 OHM
RIGHT
ZIN
SEL
GND
REM
OUT
FUSE
40A
BRIDGED
+
L
–
+
R
–
R
R
L
L
+
R
–
SPEAKER LEVEL
INPUT
PREAMP
OUTPUT
LINE
INPUT
BA
JUMPER SELECTOR
SELECT 100K OR 15 OHMS
Regardless of whether you build
or buy it, the necessary resistor
network has the following
configuration:
or buy it, the necessary resistor
network has the following
configuration:
Custom “Chip” Construction
• Each resistor in the package has
the same value.
• If you kvow the crossover
frequency you want, you can
calculate the resistor value
necessary by solving the
following equation:
calculate the resistor value
necessary by solving the
following equation:
Resistor
2,500,000
Value
=
Crossover
in Ohms
Frequency in Hz
• Use the following equation if
you have a resistor pack of a
known value, and want to find
it’s crossover frequency:
known value, and want to find
it’s crossover frequency:
Crossover
2,500,000
Frequency =
Crossover
in Hz
Resistor Value in Ohms
• To build “chips” from discrete
resistors, solder the resistores to
a standard 14-pin “DIP Head”
according to the diagram. If a
DIP Header is not available, you
may bend the leads of 1/4 watt
resistors 90 degrees, trim them
to 3mm-length, and insert them
directly into the chip sockets.
a standard 14-pin “DIP Head”
according to the diagram. If a
DIP Header is not available, you
may bend the leads of 1/4 watt
resistors 90 degrees, trim them
to 3mm-length, and insert them
directly into the chip sockets.
To change the crossover frequency
change the resistor network as
follows:
1. Remove the screws from the
change the resistor network as
follows:
1. Remove the screws from the
bottom panel as shown below.
2. Select which resistor module,
high pass or low pass, that you
wish to change.
wish to change.
3. A chip puller, wich can be
obtained from any electronics
store, is used to remove the
resistor chip. Pull the resistor
chip from the socket as shown
in figur below.
store, is used to remove the
resistor chip. Pull the resistor
chip from the socket as shown
in figur below.
4. Place the new module in the
socket making sure all pins are
lined up with the socket holes.
Press the module firmly into the
socket.
lined up with the socket holes.
Press the module firmly into the
socket.
5. Replace the bottom lid.
7
HIGH PASS
FILTER
FREQUENCY
SELECTION
MODULE
LOW PASS
FILTER
FREQUENCY
SELECTION
MODULE
C10
C13
JBL INC.
NORTHRIDGE, CA
JBL GTS600
PC00108800
REV A
CROSSOVER
6. Input Gain Adjustment
Before operating the GTS300 or
GTS600, recheck all wiring
connections to make sure they are
correct and secure. Be sure that a
fuse (40 amp for GTS300 and two
40 amp fuses for the GTS600, not
included) is installed in the +12V
line near the battery. Reconnect the
negative ground (-) terminal of the
battery. Make sure that the input
mode selector, speaker output
crossover frequency modules, and
preamp output crossover switch
are properly set.
GTS600, recheck all wiring
connections to make sure they are
correct and secure. Be sure that a
fuse (40 amp for GTS300 and two
40 amp fuses for the GTS600, not
included) is installed in the +12V
line near the battery. Reconnect the
negative ground (-) terminal of the
battery. Make sure that the input
mode selector, speaker output
crossover frequency modules, and
preamp output crossover switch
are properly set.
Adjusting the Gain
• The setting of the gain control on
• The setting of the gain control on
the GTS300 and GTS600 is
important to ensure proper
performance, low noise levels,
and maximum reliability in the
system.
Using a high signal level from
the source and a low gain setting
on the amplifier will help keep
backgroune noise levels in the
system low.
important to ensure proper
performance, low noise levels,
and maximum reliability in the
system.
Using a high signal level from
the source and a low gain setting
on the amplifier will help keep
backgroune noise levels in the
system low.
• To adjust a system using a single
amplifier, start with the amplifier
gain controls fully
counterclockwise.
gain controls fully
counterclockwise.
Set all Bass/Treble or equalizer
controls to their centered or
bypassed positions. While
listening carefully to the system
output, adjust the volume control
of the radio/tape deck to the point
where you first begin to hear
audible distortion. Reduce the
level just to the point where the
distortion goes away.
If this setting does not provide
adequate volume levels, gradually
increase (turn clockwise) the gain
control on the GTS300 ot GTS600
controls to their centered or
bypassed positions. While
listening carefully to the system
output, adjust the volume control
of the radio/tape deck to the point
where you first begin to hear
audible distortion. Reduce the
level just to the point where the
distortion goes away.
If this setting does not provide
adequate volume levels, gradually
increase (turn clockwise) the gain
control on the GTS300 ot GTS600
until the system plays as loud as
necessary ot when the first signs of
distortion are heard.
necessary ot when the first signs of
distortion are heard.
BEST-Vertical Mounting
GOOD-Horizontal Mounting
NEVER-Mount Upside Down
8
AIR FLOW
AIR FLOW
M
A
D
E
I
N
T
H
E
M
A
D
E
I
N
T
H
E
M
A
D
E
IN
T
H
E
E
U
S
A
Click on the first or last page to see other GTS 600 (serv.man2) service manuals if exist.