JBL GTS 100 (serv.man2) User Manual / Operation Manual ▷ View online
Speaker Level Input Color Codes
Left (+):
White
Left (-):
White with Black Stripe
Right (+):
Gray
Right (-):
Gray with Black Stripe
Using Both the Speaker Level Input
and Line Level Input Together
In some systems it may be desirable to
use both the speaker level inputs and
line level inputs simultaneously. For
instance, if you have a stock head unit
in your car you may connect the speaker-
level inputs of the head unit to the
GTS100. You may simultaneously con-
nect a CD player equipped with preamp
volume control to the preamp-level
inputs of the GTS100. The Universal
Interface circuitry of the GTS100 will
isolate the inputs from each other while
mixing both signals. Therefore switch-
ing from one source to the other is as
simple as turning the unused source
off, and turning the desired source on.
No other switches or relay boxes are
needed.
and Line Level Input Together
In some systems it may be desirable to
use both the speaker level inputs and
line level inputs simultaneously. For
instance, if you have a stock head unit
in your car you may connect the speaker-
level inputs of the head unit to the
GTS100. You may simultaneously con-
nect a CD player equipped with preamp
volume control to the preamp-level
inputs of the GTS100. The Universal
Interface circuitry of the GTS100 will
isolate the inputs from each other while
mixing both signals. Therefore switch-
ing from one source to the other is as
simple as turning the unused source
off, and turning the desired source on.
No other switches or relay boxes are
needed.
When using this setup it is also possible,
using the wiring setup shown below, to
allow either of the two sources to
remotely turn on the amplifier. This is
not necessary if the factory radio is of
the high power BTL type and is con-
nected to the speaker level inputs. The
Common Sense turn-on circuit will acti-
vate the GTS100 when a powered
source is used, and the conventional
remote connection of the preamp-level
source will activate the amp when it is
used.
using the wiring setup shown below, to
allow either of the two sources to
remotely turn on the amplifier. This is
not necessary if the factory radio is of
the high power BTL type and is con-
nected to the speaker level inputs. The
Common Sense turn-on circuit will acti-
vate the GTS100 when a powered
source is used, and the conventional
remote connection of the preamp-level
source will activate the amp when it is
used.
17
Speaker Connections
When connecting speaker wires, be
sure that no uninsulated wire remains
exposed and no loose strands of wire
touch either an adjoining wire, terminal
or a metal surface. Securely crimp or
solder all connections and insulate
them with heatshrink tubing.
sure that no uninsulated wire remains
exposed and no loose strands of wire
touch either an adjoining wire, terminal
or a metal surface. Securely crimp or
solder all connections and insulate
them with heatshrink tubing.
Use high quality 18 gauge or larger
speaker wire for the amplifier to speaker
connections. Larger wire or special high
performance speaker cables may
improve the performance of some
systems.
speaker wire for the amplifier to speaker
connections. Larger wire or special high
performance speaker cables may
improve the performance of some
systems.
Be very careful when speaker wire is
routed through a door hinge area to
door mounted speakers. Use grommets
and strain reliefs wherever necessary to
prevent damage to the wires.
routed through a door hinge area to
door mounted speakers. Use grommets
and strain reliefs wherever necessary to
prevent damage to the wires.
The proper speaker connection
depends on whether the GTS100 is
used bridged or stereo. The speakers
are connected to the amplifier with the
included wire harness. If you wish to
purchase the raw connector to make a
custom-length harness, the part number
is listed in the Specifications section.
This item is commonly available from
local electronic parts distributors.
depends on whether the GTS100 is
used bridged or stereo. The speakers
are connected to the amplifier with the
included wire harness. If you wish to
purchase the raw connector to make a
custom-length harness, the part number
is listed in the Specifications section.
This item is commonly available from
local electronic parts distributors.
From Head
Unit #1
Remote or
Antenna Output
Unit #1
Remote or
Antenna Output
Dual Source Remote Wiring diagram.
From Head
Unit #2
Remote or
Antenna Output
Unit #2
Remote or
Antenna Output
To
GTS100
Remote
GTS100
Remote
1N4001
Diode
1N4001
Diode
JBL 1394 Manual 7/17/98 11:49 AM Page 17
same time. This is sometimes used for
center-channel applications or for inex-
pensive subwoofer addition, essentially
creating a 3-channel system. However,
unlike a true bi-amplified subwoofer
connection, this system configuration
does not provide for control of sub-
woofer-satellite balance, it requires the
use of a passive subwoofer crossover
instead of the superior active circuitry
already built-in to the GTS100, and it
does not separate the power amps
driving the satellites from the amps
driving the subwoofer. Therefore this
connection is best used for addition of
a center-channel, or as an interim step
as you build up to a true bi-amplified
subwoofer-satellite system. Connect the
main pair of stereo speakers as in the
stereo mode, connect the mono speaker
as described above for bridge-mode
connection (see diagram on page 19).
For use in center channel applications,
a high-power “L-Pad” or power fader
can be used to attenuate the center
channel for proper level matching. For
subwoofer-satellite use, connect a non-
polarized capacitor in series with each
main speaker, and a high-power inductor
(coil) in series with the subwoofer. Your
authorized JBL dealer will help you
choose the correct values for your par-
ticular components. The input-mode
switch should be set to “STEREO”.
center-channel applications or for inex-
pensive subwoofer addition, essentially
creating a 3-channel system. However,
unlike a true bi-amplified subwoofer
connection, this system configuration
does not provide for control of sub-
woofer-satellite balance, it requires the
use of a passive subwoofer crossover
instead of the superior active circuitry
already built-in to the GTS100, and it
does not separate the power amps
driving the satellites from the amps
driving the subwoofer. Therefore this
connection is best used for addition of
a center-channel, or as an interim step
as you build up to a true bi-amplified
subwoofer-satellite system. Connect the
main pair of stereo speakers as in the
stereo mode, connect the mono speaker
as described above for bridge-mode
connection (see diagram on page 19).
For use in center channel applications,
a high-power “L-Pad” or power fader
can be used to attenuate the center
channel for proper level matching. For
subwoofer-satellite use, connect a non-
polarized capacitor in series with each
main speaker, and a high-power inductor
(coil) in series with the subwoofer. Your
authorized JBL dealer will help you
choose the correct values for your par-
ticular components. The input-mode
switch should be set to “STEREO”.
Please do not call JBL for this part; we
stock only the harness assemblies as
supplied with the amplifier.
stock only the harness assemblies as
supplied with the amplifier.
To get proper bass response and
stereo imaging, all the speakers in the
system must be “in phase.” The inputs
terminals of the speakers will be marked
in some way to identify positive and
negative polarity. Make sure that the
positive (+) speaker terminal is attached
to the positive (+) amplifier connection
in every speaker-to-amp connection. All
two conductor speaker wire has one
conductor marked in some way so it
can be easily traced.
stereo imaging, all the speakers in the
system must be “in phase.” The inputs
terminals of the speakers will be marked
in some way to identify positive and
negative polarity. Make sure that the
positive (+) speaker terminal is attached
to the positive (+) amplifier connection
in every speaker-to-amp connection. All
two conductor speaker wire has one
conductor marked in some way so it
can be easily traced.
The speaker output wire harness color
codes are listed below:
codes are listed below:
Speaker Output Color Codes
Left (+):
White
Left (-):
White with Black Stripe
Right (+):
Gray
Right (-):
Gray with Black Stripe
Stereo Connection – Connect each
speaker directly to the speaker output
harness according to the color-code
listed above. The input-mode switch
should be set to “STEREO”
speaker directly to the speaker output
harness according to the color-code
listed above. The input-mode switch
should be set to “STEREO”
Bridged-mode Connection – Connect
the loudspeaker positive (+) terminal to
the RIGHT channel positive wire (Gray).
Connect the loudspeaker negative (–)
terminal to the LEFT channel negative
wire (White with Black stripe). The
input-mode switch should be set to “R”
or “L+R”.
the loudspeaker positive (+) terminal to
the RIGHT channel positive wire (Gray).
Connect the loudspeaker negative (–)
terminal to the LEFT channel negative
wire (White with Black stripe). The
input-mode switch should be set to “R”
or “L+R”.
Simultaneous Stereo + Mono
Connection – The GTS100 may be
used to drive a stereo pair of speakers
with a mono (bridged) speaker at the
Connection – The GTS100 may be
used to drive a stereo pair of speakers
with a mono (bridged) speaker at the
18
JBL 1394 Manual 7/17/98 11:49 AM Page 18
19
L
R
LINE
IN
OUT
NOM
MIN MAX
GAIN
INPUT MODE
STEREO
CROSSOVER
OFF
HIGH
R
L+R
LOW
+
R
R
-
+
L
L
-
+
R
R
-
+
L
L
-
SPEAKER
OUTPUTS
OUTPUTS
SPEAKER
INPUTS
BRIDGED
FUSE 20A
POWER
GND
BAT(+) REM
(+)
(+)
(–)
(–)
(+)
(–)
C
C
L
Subwoofer (Low Pass)
Tweeter/Midrange Satellites
(High Pass)
High Pass Satellite
Crossover Frequency: 100Hz
Crossover Frequency: 100Hz
C:
300
µ
F Capacitor
100V, Non-Polorized
Subwoofer Low Pass
Crossover Frequency: 100Hz
Crossover Frequency: 100Hz
L:
6.2mH Air Core Inductor
20A
Right
Left
Component Values for
4 Ohm Loudspeakers*
4 Ohm Loudspeakers*
*You may scale the 100Hz values listed to a different desired frequency by using the following formulas:
A. Satellite/Subwoofer
High-Pass:
x 300
µ
F = New Capacitor Value
100
desired frequency in Hz
Low-Pass:
x 6.2mH = New Inductor Value
100
desired frequency in Hz
L
R
LINE
IN
OUT
NOM
MIN MAX
GAIN
INPUT MODE
STEREO
CROSSOVER
OFF
HIGH
R
L+R
LOW
+
R
R
-
+
L
L
-
+
R
R
-
+
L
L
-
SPEAKER
OUTPUTS
OUTPUTS
SPEAKER
INPUTS
8
Ω
L-Pad
(Optional But Recommended)
BRIDGED
FUSE 20A
POWER
(+)
(–)
(+)
(+)
(–)
(–)
Stereo, Non-Bridged
Speaker Connection*
Speaker Connection*
Center Channel
Bridged Speaker Connection*
Bridged Speaker Connection*
* Center Channel Speaker Minimum 8 Ohms, Main Speakers
Minimum 4 Ohms When Used Simultaneously.
8
Ω
Minimum
4
Ω
Minimum
4
Ω
Minimum
20A
B. Center Channel
GND
BAT(+) REM
Simultaneous Stereo-Mono
Connection Diagrams
Connection Diagrams
JBL 1394 Manual 7/17/98 11:49 AM Page 19
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 distor-
tion goes away. This is the maximum
undistorted output level of your head
unit and signal processors, and should
not be exceeded during use. If audible
distortion does not occur, continue to
increase the level until the head unit is
turned all the way up. If this setting
does not provide adequate volume lev-
els, gradually increase (turn clockwise)
the gain control of the GTS100 until the
system plays as loud as necessary or
when the first signs of distortion are
heard.
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 distor-
tion goes away. This is the maximum
undistorted output level of your head
unit and signal processors, and should
not be exceeded during use. If audible
distortion does not occur, continue to
increase the level until the head unit is
turned all the way up. If this setting
does not provide adequate volume lev-
els, gradually increase (turn clockwise)
the gain control of the GTS100 until the
system plays as loud as necessary or
when the first signs of distortion are
heard.
When multiple amplifiers are used in
the system, it is best to adjust the gain
of the amplifier driving the main (usually
front) speakers first. Then turn down the
head unit’s volume control to a comfort-
able level, and adjust the remaining
amplifiers for the desired system bal-
ance. You will find this easiest to do by
adjusting the amplifiers in the following
order: 1) front-channels, 2) rear-chan-
nels, 3) subwoofers. Complex systems
incorporating tri-or quad-amplification
can be time consuming to adjust. Your
local authorized JBL installation special-
ist is the best person to help with such
adjustment.
the system, it is best to adjust the gain
of the amplifier driving the main (usually
front) speakers first. Then turn down the
head unit’s volume control to a comfort-
able level, and adjust the remaining
amplifiers for the desired system bal-
ance. You will find this easiest to do by
adjusting the amplifiers in the following
order: 1) front-channels, 2) rear-chan-
nels, 3) subwoofers. Complex systems
incorporating tri-or quad-amplification
can be time consuming to adjust. Your
local authorized JBL installation special-
ist is the best person to help with such
adjustment.
Other Characteristics
Turn-On Delay – When installed as
described in this manual, the GTS100
will turn on and off with the head unit or
the vehicle’s ignition switch. When the
amplifier is turned on, there is a time
delay of several seconds (longer in cold
Turn-On Delay – When installed as
described in this manual, the GTS100
will turn on and off with the head unit or
the vehicle’s ignition switch. When the
amplifier is turned on, there is a time
delay of several seconds (longer in cold
20
Operation
Before operating the GTS100, recheck
all wiring connections to make sure they
are correct and secure. Be sure that a
20 amp fuse (not included) is installed
in the +12V line next to the battery.
Reconnect the negative ground (–)
terminal of the battery. Make sure
that the input mode selector, crossover
switch and preamp mode switch are
properly set.
all wiring connections to make sure they
are correct and secure. Be sure that a
20 amp fuse (not included) is installed
in the +12V line next to the battery.
Reconnect the negative ground (–)
terminal of the battery. Make sure
that the input mode selector, crossover
switch and preamp mode switch are
properly set.
Gain Adjustments
The setting of the gain control on the
GTS100 is important to ensure proper
performance, low noise levels, and
maximum reliability in the system. As a
general rule, controls on components at
the front-end of the system (Source,
equalizers, electronic crossovers, etc.)
should be set as
The setting of the gain control on the
GTS100 is important to ensure proper
performance, low noise levels, and
maximum reliability in the system. As a
general rule, controls on components at
the front-end of the system (Source,
equalizers, electronic crossovers, etc.)
should be set as
high as possible, with
the amplifier gain control set as
low
as possible while still providing ade-
quate volume levels. Using a high sig-
nal level from the source and a low
gain setting on the amplifier will help
keep background noise levels in the
system low.
quate volume levels. Using a high sig-
nal level from the source and a low
gain setting on the amplifier will help
keep background noise levels in the
system low.
To adjust a system using a single
amplifier, start with the amplifier input
sensitivity controls fully counterclock-
wise. Some radio/tape decks have addi-
tional output level controls or switches.
Set those to their maximum position.
Set the level controls on any associated
equipment such as equalizers and
electronic crossovers to the maximum
position or as recommended by the
manufacturer. Set all Bass/Treble or
equalizer controls to their centered or
bypassed positions. While listening
amplifier, start with the amplifier input
sensitivity controls fully counterclock-
wise. Some radio/tape decks have addi-
tional output level controls or switches.
Set those to their maximum position.
Set the level controls on any associated
equipment such as equalizers and
electronic crossovers to the maximum
position or as recommended by the
manufacturer. Set all Bass/Treble or
equalizer controls to their centered or
bypassed positions. While listening
JBL 1394 Manual 7/17/98 11:49 AM Page 20
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