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1. Introduction
either subwoofer or com ponent
speakers in a bi-am plified system ,
or conventional full-range speakers
in sim pler system s.
The GTS300 and 600 also include
pream p-level outputs which can
provide either full-range, high-pass
or low-pass signal to drive
Thanks for purchasing your new
GT series autom otive am plifier.
The GT series am plifier you have
chosen includes m any unique
features to enhance its perfor-
m ance and utility. The power am p-
lifier circuitry is a fully discrete
design notable for its low dis-
tortion and unusually clean and
clear sound quality. Your GT series
am plifier will easily connect to
virtually any car audio system ,
whether it is factory installed or
one purchased separately.
additional am plifiers. This lets you
build system s of virtually any
design without requiring a
separate electronic crossover.
1.2 About Installation
Although the GTS300 and GTS600
are designed to m ake installation
as easy as possible, they are
sophisticated products that require
proper installation to realize their
full perform ance potential.
If you feel you do not have the
necessary knowledge and skills w e
strongly recom m end that the
installation be done by your
authorized J BL dealer.
If you choose to install the GTS300
or GTS600 yourself read all of the
inform ation in this m anual
before you start the installation.
Pay particular attention to the
safety precautions and notes.
In addition to conventional
pream plevel inputs, this m odel
features J BL’s Universal Interface
design, which facilitates sim ple
connection to factory radios with
the low distortion that is usually
only associated with pream p level
connection. With Universal Inter-
face, a factory radio can be used
either as the m ain m usic source or
com bined with a CD player or
changer, which includes volum e
control capability, sim ultaneously
connected to the am plifier. By
providing this two-unit direct
connection, Universal Interface
circuitry elim inates the need for an
FM m odulator to interface a CD
player to factory radios, im proving
the fidelity of digital playback.
In addition, when using a high-
powered (BTL) radio through the
speaker-level inputs, Com m on
Sense turn-on circuitry senses the
com m on-m ode voltage present on
the radio’s speaker wires, turning
the am plifier on without an
2. Installation and Use
Refer to the “Crossover Frequency
Adjustm ents” and “Speaker Level
Input Im pedance Adjustm ents”
sections of this m anual to see if
you will need to m ake alterations
to their factory settings. If you are
not using the built-in crossover, or
the speaker level inputs, you m ay
skip this step.
additional “rem ote” wire.
1. Disconnect the negative cable
from the battery. Note: If the
vehicle’s radio features a code
type security system , m ake
Also, the built-in active crossover
provides either full-range, high-
pass or low-pass operation. This
lets your GT series am plifier power
certain you know the code
1
9. Fuse – 40 Am p ATC type fuse for
the GTS300 and two 40 am p fuses
for the GTS600.
10. Gain Control – Use this control
to adjust the input sensitivity of
the am plifier. See the “Adjusting
the Gain” section for tips on
proper setup.
11. Pream p-Output Crossover
Switch – This switch controls the
built-in crossover that is directed
to the pream p-output connectors.
Set the switch to “Flat” for full
band operation. Set this switch to
“Low-Pass” to activate the low-
pass filter on the pream p output
(for subwoofer use). Set the switch
to “High-Pass” to activate the
high-pass filter for use with
pass filter on the am plifier (for
subwoofer use). Set the switch to
“High Pass” to activate the high
pass filter for use with satellite
speakers.
13. Input Mode Selector – This
switch is used to set the input
m ode for both pream p and
speaker-level inputs.
Set this switch to Stereo for
norm al operation using both left
and right inputs. Set this switch to
R to drive both the left and right
output channels with only a single
input on the right channel. Set this
switch to “L+R” to sum the left
and right inputs for a m ono output
on both am plifier channels.
Power Indicator LED (on chassis
top) – LED steadily illum inates for
norm al operation. LED blinks
when protection circuitry or
m uting is engaged.
satellite speakers.
12. Speaker Output Crossover
Switch – This switch controls the
built-in crossover that is connected
to the power am plifier circuitry.
Set the switch to “Flat” for full
band operation. Set this switch to
“Low Pass” to activate the low
14. Bass Boost Switch – This
activates a built-in Bass Boost
circuit used to increase low-bass
output.
SPEAKER
OUTPUT
LINE
INPUT
PREAMP
OUTPUT
SPEAKER LEVEL
INPUT
POWER
FUSE
40A
+
+
L
L
R
L
REM IN
+
+
_
_
REM OUT
R
_
L
_
BATT(+)
GND
R
R
BRIDGED
➀ Preamp Level RCA Inputs
➄Remote Turn On Output
➁ Preamp Level RCA Outputs
➂High Level Speaker Inputs
➃Speaker Outputs
➅Battery Ground
➆Battery (+12v) In
➇Remote Turn On Input
➈ Fuse
Power
Connector
SPEAKER OUTPUT
CROSSOVER
PREAMP OUTPUT
CROSSOVER
BASS BOOST
INPUT MODE
NOM
R
L+R
FLAT
OFF
ON
HIGH PASS
FLAT
HIGH PASS
LOW PASS
STEREO
LOW PASS
MIN
MAX
GAIN
➉Gain Control
Preamp Crossover Frequency Selector
Amplifier Crossover Frequency Selector
Input Mode Selector
Bass Boost
3
3.2 Signal Sources
3. System Design Using the
GTS300 or GTS600:
The low level pream p outputs of
any radio/tape deck, CD player or
pream p/equalizer so equipped can
drive the GTS300 or GTS600. The
gain controls of the GTS300 or
GTS600 are used to m atch the
am plifier’s input sensitivity to the
output voltage of the source. This
m atching is im portant to keep
noise low and is explained in the
“Adjusting the Gain” section of
this m anual.
Thanks to Universal Interface
Circuitry, the GTS300 or GTS600
can also be connected to power
am plifiers, radios or equalizers
that are equipped with only
speaker outputs by connecting
them through the speaker level
input connector. Inside the GTS300
or GTS600, the speaker-level and
pream p-level inputs are connected
through a m ixing circuit, which
allows them to be used
3.1 Speaker Requirem ents
When used in the non-bridged
m ode the GTS300 or GTS600 can
easily drive 2 ohm speaker loads.
When only one speaker is
connected to each channel,
virtually any conventional speaker
m ay be used.
When the GTS300 or GTS600 is in
bridged m ode, the com bined
im pedance of the speaker (or
speakers) connected to the bridged
channel should be at least 4 ohm s.
Sustained operation of the GTS300
or GTS600 in bridged m ode with
less than 4 ohm s will likely cause
overheating.
The GTS300 or GTS600 m ust not
be used w ith speakers that have
either one of their input term inals
w ired to the fram e of the speaker
or to the chassis of the vehicle.
sim ultaneously. Therefore a low
level source, such as a CD player
equippe with a volum e control
m ay be connected to the pream p-
level inputs at the sam e tim e as a
powered radio/tape unit is
Parallel Wiring
(+)
2 Ohms
Nominal
4 Ohms
4 Ohms
connected to the speaker-level
inputs. This provides a higher
perform ance alternative to an FM
Modulator connection when you
wish to add CD capability to a
factory casette stereo. Switching
from one source to the other is as
sim ple as turning the desired
source on and turning the
Impedance
(–)
(+)
Series Wiring
4 Ohms
undesired one off – no additional
switches or relay connections are
needed.
8 Ohms
Nominal
Impedance
4. Wiring
Proper wiring of the GTS300 or
GTS600 and the associated
4 Ohms
(–)
4
com ponents is extrem ely
im portant for proper perform ance
and long term reliability.
loosen with age and extrem e
tem peratures. Never leave bare
wire exposed.
All wiring connections should be
m ade either by soldering with
heatshrink tubing insulation or
with high quality crim p type
insulated connectors installed with
a good crim ping tool. Soldering
crim p connections is recom -
m ended to further enhance
connection reliability. Never use
wire-nuts, insulation-displacem ent
connectors (i.e. ScotchLok type), or
“twist and tape” connections. Do
not use electrical tape; it will
Route the wiring through the car
carefully. Do not allow wires to lay
against sharp sheet m etal edges or
any other surfaces that m ight wear
away or cut through the insulation
of the wire. Use insulated strain
reliefs, rubber grom m ets and
plastic tubing to protect the wires
whenever they are run through
sheet m etal panels or are placed
where they m ight be pulled or
dam aged.
Cassette/CD Tuner
Speaker Level Output Connection
(Use only when line level ouput
is not available)
CD Player
or Changer
Cassette/CD Tuner
Antenna Input
CD Input
Power
Antenna
Cassette/Receiver
Power Supply
Wires
Cassette/CD Preamp Output
Power
Antenna
Relay
Amplifier
Power
Connection
Amplifier
Speaker
Level
Input
Amplifier
Speaker
Output
Line
Input
Connection
+
–
+
Speakers
Blue w/White Stripe - Remote On/Off
Ignition Switch
GTS300 – 40 Amp
GTS600 – 80 Amp
(Not Included)
Fuse
Main +12V
+
–
Vehicle Battery
Power Ground
Chassis Ground
5
Crossover Frequency
Adjustm ents
5. Internal Adjustm ents
Speaker-Level Input
Im pedance Adjustm ents
The GTS300 and GTS600 am pli-
fiers include built-in frequency
selectable crossovers. One
The speaker level inputs of the
GTS300 and GTS600 com e factory
set with 100K ohm input im pe-
dance. This will provide the lowest
distortion operation from the
speaker outputs of m ost m odern
head units by reducing the power
the am plifier in the head unit m ust
deliver to practically nothing.
On som e 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 im pedance of the speaker-
level inputs to 15 ohm s. This is
accom plished by connecting the
jum pers as shown in the diagram
below.
crossover is connected in series
with the am plifier circuitry and the
other crossover is connected to the
pream p 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
am plifier. These “chips” are
sim ply a set of resistors,
connected across the pins and
m olded into a single package.
The crossover frequencies m ay
be changed to any value desired
by changing the resistor
network. J BL has “chips”
available in the popular values
listed in the table below. If none
of these suit your system , you
m ay pruchase com patible
JUMPER SELECTOR
SELECT 100K OR 15 OHMS
R
R
BALANCED
RIGHT
INPUTS
ZIN
SEL
L
resistor networks from a local
electronics store, or you m ay
build you own custom values
from discrete resistors m ounted
on a 14-pin “DIP Header” using
the instructions which follow.
L
I N P U T
L I N E
15 OHM
B R I D G E D
O U T P U T
P R E A M P
100K
–
15 OHM
R
+
LEFT
ZIN
SEL
–
R
100K
I N P U T S P E A K E R L E V E L
–
L
+
SPEAKER
INPUT
IMPEDANCE
SELECTOR
40
B A
4 0 A
F U S E
G N
O U
R E
• If the head unit has 4 channels of
builtin am plification and/or an
electronic fader control, you
should leave the jum pers in the
factory set position.
• If the head unit has 2 channels of
am plification, with a speaker-
level fader, the jum pers should
be set to the 15-ohm position.
This will always be a rotary-type
control, not one controlled by
elecronic pushbuttons.
Frequency Resistor J BL Part
Value
47 K
33 K
20 K
12 K
10 K
4.7 K
1 K
Num ber
GTM 50
GTM 80
GTM 120
GTM 200
GTM 250
GTM 500
GTM 2500
GTM 5000
50 Hz
80 Hz
120 Hz
200 Hz
250 Hz
500 Hz
2.5 Hz
5 Hz
470
6
Regardless of whether you build
or buy it, the necessary resistor
network has the following
configuration:
• 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
m ay bend the leads of 1/4 watt
resistors 90 degrees, trim them
to 3m m -length, and insert them
directly into the chip sockets.
Custom “Chip” Construction
To change the crossover frequency
change the resistor network as
follows:
1. Rem ove the screws from the
bottom panel as shown below.
2. Select which resistor m odule,
high pass or low pass, that you
wish to change.
3. A chip puller, wich can be
obtained from any electronics
store, is used to rem ove the
resistor chip. Pull the resistor
chip from the socket as shown
in figur below.
• Each resistor in the package has
the sam e value.
• If you kvow the crossover
frequency you want, you can
calculate the resistor value
necessary by solving the
following equation:
Resistor
Value
in Ohm s
2,500,000
Crossover
Frequency in Hz
=
JBL INC.
REV
JBL GTS600
NORHRIDGE, CA
A
PC00108800
FILTER
LOW PASS
CROSSOVER
FREQUENMCOYDULE
SELECTION
C10
C13
FILTER
HIGH PASS
FREQUENMCOYDULE
SELECTION
• Use the following equation if
you have a resistor pack of a
known value, and want to find
it’s crossover frequency:
4. Place the new m odule in the
socket m aking sure all pins are
lined up with the socket holes.
Press the m odule firm ly into the
socket.
Crossover
2,500,000
Crossover
Frequency =
in Hz
Resistor Value in Ohm s
5. Replace the bottom lid.
7
6. Input Gain Adjustm ent
Before operating the GTS300 or
GTS600, recheck all wiring
until the system plays as loud as
necessary ot when the first signs of
distortion are heard.
connections to m ake sure they are
correct and secure. Be sure that a
fuse (40 am p for GTS300 and two
40 am p fuses for the GTS600, not
included) is installed in the +12V
line near the battery. Reconnect the
negative ground (-) term inal of the
battery. Make sure that the input
m ode selector, speaker output
crossover frequency m odules, and
pream p output crossover switch
are properly set.
BEST-Vertical Mounting
AIR FLOW
Adjusting the Gain
• The setting of the gain control on
the GTS300 and GTS600 is
im portant to ensure proper
perform ance, low noise levels,
and m axim um reliability in the
system .
Using a high signal level from
the source and a low gain setting
on the am plifier will help keep
backgroune noise levels in the
system low.
• To adjust a system using a single
am plifier, start with the am plifier
gain controls fully
GOOD-Horizontal Mounting
counterclockwise.
Set all Bass/Treble or equalizer
controls to their centered or
bypassed positions. While
AIR FLOW
listening carefully to the system
output, adjust the volum e 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.
NEVER-Mount Upside Down
If this setting does not provide
adequate volum e levels, gradually
increase (turn clockwise) the gain
control on the GTS300 ot GTS600
8
7. Typical Applications
The following diagram s show the
m ost com m on basic system
configurations of the GTS300 and
GTS600. A com bination of one or
m ore of these “building blocks”
m ay be com bined to form elabo-
rate system designs.
9
Application 1
Stereo Full-Range or Subwoofer Operation
Preamp or
Speaker-Level
Input
L
R
Full-Range Operation
Speaker Output
Crossover
Switch
Input Mode
Switch
Flat
Stereo
Subwoofer Operation
Speaker Output
GTS300/600
Crossover
Switch
Input Mode
Switch
L– L+
R– R+
2 or 4-Ohm
Full-Range
Speakers or
Subwoofers
–
+
–
+
Low Pass
Stereo
Main speakers are driven by head unit or
additional amplifier.
Application 2
Bridge-Mode Operation
R
Preamp or
L
Speaker Level
Single Amplifier:
Subwoofer-Operation (Mono)
Speaker Output
Amp
Crossover
Switch
Input Mode
Switch
For Dual-Amplifier
For Single Amplifier
Subwoofer Use
Full-Range or Subwoofer Use
B
Low Pass
L + R
L
R
R
Main speakers are driven by head unit or
additional amplifier.
Dual Amplifier:
Subwoofer-Operation (Stereo)
Speaker Output
Amp
Crossover
Switch
Input Mode
Switch
GTS300/600
GTS300/600
A
B
A + B
Low Pass
R
Full-Range Operation (Stereo)
L– R+
L– R+
4-Ohm
4-Ohm
Speaker Output
Full-Range
Speaker or
Subwoofer
Full-Range
Speaker or
Subwoofer
Amp
Crossover
Switch
Input Mode
Switch
–
+
–
+
A + B
Flat
R
Application 3
Bi-am plified, Three-channel
Front
Rear
Subwoofer/SatelliteSystem
Preamp or
Speaker-Level
Input
Speaker Output
R
L
R
L
Amp
Crossover
Switch
Input Mode
Switch
A
B
High Pass
Low Pass
Stereo
L + R
GTS300/600
GTS300/600
A
B
Stereo Subwoofers may be used by configuring
Amp B as shown in Application #1.
L– R+
L– R+
L– R+
4-Ohm
Subwoofer
2 or 4-Ohm
Full-Range
Speakers
–
+
–
+
–
+
10
Application 4
Bi-am plified, System Using
Preamp or
Speaker-Level
Input
Pream p Output Capability
Preamp
Output
Preamp
Intput
L
R
R
L
L
R
Speaker Output
Crossover
Switch
Amp
Input Mode
Switch
Preamp
Output
Crossover
A
B
High Pass
Low Pass
Stereo
L + R
Flat
Doesn't Matter
GTS300/600
GTS300/600
B
Stereo Subwoofers may be used by configuring
Amp B as shown in Application #1 or by
using dual GTS amplifiers as shown in
Application 2.
A
L– L+
R– R+
L– R+
2 or 4-Ohm
4-Ohm
Subwoofer
Full-Range
Speakers
–
+
–
+
–
+
Sim ultaneous Stereo-Mono
Connection Diagram s
Subwoofer (Low Pass)
A. Satellite/Subwoofer
Component Values for
4 Ohm Loudspeakers*
(+)
(–)
High Pass Satelite
Crossover Frequency: 100Hz
Tweeter/Midrange Satellites
(High Pass)
Right
Left
C: 300µF capacitor
100V, non polorized
(+)
C
(+)
C
(–)
(–)
L
Subwoofer Low pass
Crossover Frequency: 100Hz
L: 6.2mH air core inductor
GTS300 or GTS600
SPEAKER
OUTPUT
LINE
INPUT
SPEAKER LEVEL
INPUT
PREAMP
OUTPUT
POWER
FUSE
40A
+
+
R
L
L
L
+
R
+
L
_
_
_
REM IN
BATT(+)
REM OUT
GND
R
R
BRIDGED
*You may change the subwoofer satelite crossover frequency by using the Inductor and Capacitor values calculated
with the following formulas:
30,000
High Pass (Satelite Crossover):
Low Pass (Subwoofer Crossover):
= New Capacitor Value in µF
Desired crossover Frequency in Hz
620
= New Inductor Value in mH
Desired crossover Frequency in Hz
11
8. In Case of Difficulty
Power-on light does not
com e on
• Head unit not on; turn the head unit on.
• Ground wire is disconnected or
defective; check for continuity with an
ohm -m eter between the am plifier’s
ground term inal and a know chassis
ground point.
• Battery wire is disconnected or
defective; check approxim ately +12
volts between the am plifier’s battery
and ground term inals.
• Blow fuse; check am plifier’s located on
the endpanel near the power connector.
If it is blown replace it with an identical
one. If the new fuse blows im m ediately,
then check all the wiring connection. If
no fault is found, consult your J BL
dealer.
• Rem ote-on wire between the head unit
and the am plifier is disconnected or
defective; check for +12 volts between
am plifier’s rem ote-on input term inal
and the ground input term inal with the
head unit on.
Power light is on, but no
sound is heard from som e
or all of the speakers
• Incorrect switch settings; m ake sure
that all switchs (input m ode and
crossover) are in their correct positions
for your system configuration.
• Incorrectly connected or shorted
speaker wires; check for shorts in
wiring.
• Defective or disconnected audio cables;
check for continuity and replace if
necessary.
• Incorrect Gain Adjustm ent; verify that
the am plifier gain controls are not
turned com pletely down. If they are,
sound output level m ay be very low
and m ay give the im pression that the
system ) or part of the system ) is dead.
• Defective head unit or signal processor;
check each com ponent for proper
wiring and operation.
12
• Defective GTS300 or GTS600; If there is
audio signal present at the input of the
am plifier and there is no output, the
GTS300 or GTS600 m ay be defective.
Power On light is blinking,
indicating a fault condition,
and sound is interm ittent or
off
• Incorrectly connected or shorted
speaker wires; check for shorts, frayed
wiring, dam aged wiring insulation or
incorrect wiring.
• The speaker com bination connected to
the am plifier is less than the m inim um
requirem ent; reconfigure speaker
connection after consulting with section
3.1 “Speaker Requirem ents.”
• Am plifier is dam aged; consult your J BL
Dealer.
Alternator whine through
the audio system with the
engine running
• Ground loops; verify that the chassis
grounding point you have chosen is
true ground by checking for continuity
between the chassis ground point and
battery ground.
Bass output from speakers
too low
• Speaker wired out of phase; check for
proper polarity on all speaker wiring (+
am p term inal to + speaker term inal and
– am p term inal to – speaker term inal).
13
9. Specifications
Specifications
GTS300
GTS600
Power Output
100 Watts x 2
200 Watts x 2
(10Hz -50kHz,
(4 Ohm s, 0.05% THD)
(4 Ohm s, 0.05% THD)
14.4V Battery Voltage
150 Watts x 2
300 Watts x 2
(2 Ohm s, 0.08% THD)
(2 Ohm s, 0.08% THD)
300 Watts x 1
600 Watts x 1
(4 Ohm s, 0.08% Thd)
(4 Ohm s, 0.08% Thd)
Signal to Noise Ratio
Frequency Response
100dBA
100dBA
10Hz - 50kHZ (+0, -1dB)
10Hz - 50kHZ (+0, -1dB)
20Hz - 20kHZ (+0, -0.1dB) 20Hz - 20kHZ (+0, -0.1dB)
Dam ping Factor
>200
>200
Line Level Input Sensitivity 100m V - 4V RMS
100m V - 4V RMS
(500m V Nom inal)
(For Rated Power)
(500m V Nom inal)
Line Level Input
Im pedance
10k Ohm s
10k Ohm s
Speaker Level Input
Im pedance
15 Ohm or 100k Ohm
(Selected By Internal
J um pers)
15 Ohm or 100k Ohm
(Selected By Internal
J um pers)
Speaker Level Input
Sensitivity
200m V - 8V RMS
(2V Nom inal)
200m V - 8V RMS
(2V Nom inal)
Pream p Output Sensitivity 1V out for 4V
Speaker Level Input
1V out for 4V
Speaker Level Input
Minim um Speaker
Im pedance
Single Ended
(Non-Bridged)
2 Ohm s
4 Ohm s
2 Ohm s
4 Ohm s
Bridged
Built in Electronic
Crossover Frequency
and Slope
18dB per Octave Low Pass 18dB per Octave Low Pass
Filter, Frequency Chips
Available from 50-5kHZ
Filter, Frequency Chips
Available from 50-5kHZ
18dB per Octave High Pass 18dB per Octave High Pass
Filter, Frequency Chips
Available from 50-5kHZ
Filter, Frequency Chips
Available from 50-5kHZ
Bass Boost Frequency
and Magnitude
4dB at 40Hz
4dB at 40Hz
14
Specifications
GTS300
GTS600
Power Requirem ent
11 to 16V DC
Negative Ground
11 to 16V DC
Negative Ground
Fuse Size
40 Am p ATC Type Fuse
40 Am p ATC Type Fuse
(2 per Am plifier)
Size (L x W x H)
13 1/4”x 9 1/4”x 2”
(337 m m x 235 m m x
51 m m )
17 1/4”x 11 1/4”x 2”
(438 m m x 286 m m x
50.8 m m )
Weight
10 lbs 8.5 oz (4.8 Kg)
13 lbs 11.5 oz (6.2 Kg)
Speaker Level Input
Mating Connector
Molex Mini-Fit J r.
# 39-01-2045-P
Metal Pins: 39-00-0039
Molex Mini-Fit J r.
# 39-01-2045-P
Metal Pins: 39-00-0039
15
DECLARATION OF CONFORMITY
We, Harm an Marketing Europe a/s
Kongevejen 194B
DK-3460 Birkerød
DENMARK
declare that the product described in
this owner’s m anual is in com pliance
with technical standards:
EN 55020, EN 6.1988,
Accredited test laboratory:
MIKES PRODUCT SERVICE Gm bH
Ohm strasse 2-4
D-94342 Strasskirchen
GERMANY, (date tbd)
JBL Consumer Products, Inc.
80 Crossways Park West
Woodbury, NY 11799
Steen Michaelsen
Harm an Marketing Europe a/s
8500 Balboa Blvd.
Northridge, CA 91329
800-336-4 JBL
The appliance conform s with EEC
directive 87/308/EEC regarding
interference suppression
A Harm an International Com pany
Part No. JBLGTS100 OM
16
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