JBL GTS 100 (serv.man2) User Manual / Operation Manual ▷ View online
5
5. Connect the outputs from the signal
source to the appropriate inputs of
the amplifier according to the Wiring
Diagram (page 13) with either high
quality low-level signal cables with
RCA plugs, with the supplied
Speaker-level input connector, or
both.
the amplifier according to the Wiring
Diagram (page 13) with either high
quality low-level signal cables with
RCA plugs, with the supplied
Speaker-level input connector, or
both.
6. Connect the speakers to the ampli-
fier according to the wiring diagram
on page 13.
on page 13.
7. Turn the input sensitivity adjustment
to the
1
/
4
position.
8. Set the input level switch to “line”
if you are using the line-level
(preamp) inputs.
(preamp) inputs.
9. Set the crossover switch as desired.
10. Set the input mode switch to
stereo, left + right or right input
only operation.
only operation.
11. Reconnect the negative battery
cable.
12. Turn on the signal source at a low
volume level and check for the
correct output from each speaker.
correct output from each speaker.
13. Adjust the amplifier gain control,
using the procedure described in
the Gain Adjustment section on
page 20.
the Gain Adjustment section on
page 20.
14. Read the rest of the manual to get
maximum use and enjoyment from
your amplifier.
your amplifier.
Quick Start
Recommended for experienced
professional installers only!
professional installers only!
1. Disconnect the negative cable from
the battery.
Note: If the vehicle’s
radio features a code type security
system, make certain you know the
code before disconnecting the
battery!
system, make certain you know the
code before disconnecting the
battery!
2. Mount the amplifier to the desired
location using four screws.
3. Run a minimum AWG #10 power
cable complete with a 20 amp fuse
(not included) directly from the posi-
tive +12V battery terminal to the
desired amplifier location. Keep
the fuse to within 5" of the battery
terminal, and before the wire runs
through any metal partition.
(not included) directly from the posi-
tive +12V battery terminal to the
desired amplifier location. Keep
the fuse to within 5" of the battery
terminal, and before the wire runs
through any metal partition.
Note: All wiring connections should be
made either by soldering with heat-
shrink 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, insula-
tion-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.
made either by soldering with heat-
shrink 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, insula-
tion-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.
4. Connect power wiring as shown in
the
Wiring Diagram on page 13,
using the supplied power harness.
JBL 1394 Manual 7/17/98 11:49 AM Page 5
System Design Using the
GTS100
GTS100
Speakers
When used in the non-bridged mode,
the GTS100 can easily drive 2 ohm
speaker loads. When only one speaker
is connected to each channel, virtually
any common speaker may be used.
When two speakers are connected in
parallel to a given channel, each speaker
must have a minimum impedance of at
least 4 ohms to ensure that the com-
bined load does not drop below 2 ohms.
Although the amplifier will not be dam-
aged, load impedances lower than 2
ohms will eventually cause the amplifier
to overheat, activating the protection
circuits and causing the unit to shut off
until it cools down sufficiently.
When used in the non-bridged mode,
the GTS100 can easily drive 2 ohm
speaker loads. When only one speaker
is connected to each channel, virtually
any common speaker may be used.
When two speakers are connected in
parallel to a given channel, each speaker
must have a minimum impedance of at
least 4 ohms to ensure that the com-
bined load does not drop below 2 ohms.
Although the amplifier will not be dam-
aged, load impedances lower than 2
ohms will eventually cause the amplifier
to overheat, activating the protection
circuits and causing the unit to shut off
until it cools down sufficiently.
6
(+)
(-)
(+)
(-)
Parallel Wiring
Series Wiring
2 Ohms
Nominal
Impedance
Nominal
Impedance
8 Ohms
Nominal
Impedance
Nominal
Impedance
4
Ohms
4
Ohms
4
Ohms
4
Ohms
When the GTS100 is in bridged mode,
the combined impedance of the speaker
(or speakers) connected to the bridged
channel should be at least 4 ohms. As
in the example above, sustained opera-
tion of the GTS100 in bridged mode
with less than 4-ohms will likely cause
overheating. If monaural operation is
desired, and two 4-ohm speakers are
used, it is best to connect each speaker
to an individual amplifier channel and
use the “L+R” mode on the input-mode
switch to provide monaural operation.
the combined impedance of the speaker
(or speakers) connected to the bridged
channel should be at least 4 ohms. As
in the example above, sustained opera-
tion of the GTS100 in bridged mode
with less than 4-ohms will likely cause
overheating. If monaural operation is
desired, and two 4-ohm speakers are
used, it is best to connect each speaker
to an individual amplifier channel and
use the “L+R” mode on the input-mode
switch to provide monaural operation.
The GTS100 must not be used with
speakers that have either one of their
input terminals wired to the frame of
the speaker or to the chassis of the
vehicle.
speakers that have either one of their
input terminals wired to the frame of
the speaker or to the chassis of the
vehicle.
Signal Sources
The low level preamp outputs of any
radio/tape deck, CD player or preamp/
equalizer so equipped can drive the
GTS100. The Gain control of the
GTS100 is used to match the amplifier
to the output voltage of the source.
This matching is important to keep
noise low and is explained in the Gain
Adjustments section of this manual
(page 20).
The low level preamp outputs of any
radio/tape deck, CD player or preamp/
equalizer so equipped can drive the
GTS100. The Gain control of the
GTS100 is used to match the amplifier
to the output voltage of the source.
This matching is important to keep
noise low and is explained in the Gain
Adjustments section of this manual
(page 20).
Thanks to Universal Interface circuitry,
the GTS100 can also be connected to
power amplifiers, radios or equalizers
that are equipped with only speaker
outputs by connecting them through the
speaker level input connector. Inside
the GTS100, the speaker-level and
preamp-level inputs are connected
through a mixing circuit, which allows
them to be used simultaneously.
Therefore a low level source, such as
a CD player equipped with preamp
the GTS100 can also be connected to
power amplifiers, radios or equalizers
that are equipped with only speaker
outputs by connecting them through the
speaker level input connector. Inside
the GTS100, the speaker-level and
preamp-level inputs are connected
through a mixing circuit, which allows
them to be used simultaneously.
Therefore a low level source, such as
a CD player equipped with preamp
JBL 1394 Manual 7/17/98 11:49 AM Page 6
7
controls (Volume, Balance, Bass,
Treble) may be connected to the pre-
amp-level inputs at the same time as a
powered radio/tape unit is connected to
the speaker-level inputs. This provides
a higher performance alternative to an
FM Modulator connection when you
wish to add CD capability to a factory
installed cassette radio. Switching from
one source to the other is as simple as
turning the desired source on and turn-
ing the undesired one off — no addi-
tional switches or relay connections are
needed.
Treble) may be connected to the pre-
amp-level inputs at the same time as a
powered radio/tape unit is connected to
the speaker-level inputs. This provides
a higher performance alternative to an
FM Modulator connection when you
wish to add CD capability to a factory
installed cassette radio. Switching from
one source to the other is as simple as
turning the desired source on and turn-
ing the undesired one off — no addi-
tional switches or relay connections are
needed.
Typical Applications
Other Components
The system options of the GTS100
are numerous. All JBL amplifiers are
designed with sufficient adjustment
range to match with the accepted “nor-
mal” voltages and impedances used by
virtually all car audio components. With
very few exceptions, the GTS100 will
match correctly to any equipment you
already have.
The system options of the GTS100
are numerous. All JBL amplifiers are
designed with sufficient adjustment
range to match with the accepted “nor-
mal” voltages and impedances used by
virtually all car audio components. With
very few exceptions, the GTS100 will
match correctly to any equipment you
already have.
2 or 4-Ohm
Full-Range
Speakers or
Subwoofers
L– L+
– +
R– R+
– +
GTS100
GTS
100
Application 1
Stereo Full-Range or Subwoofer Operation
Full-Range Operation
Subwoofer Operation
Crossover Input Mode Line
Switch Switch Switch
Off
Switch Switch Switch
Off
Stereo
In
Crossover Input Mode Line
Switch Switch Switch
Low
Switch Switch Switch
Low
Stereo
In
Main speakers are driven by head unit or additional amplifier.
Preamp or
Speaker-Level
Input
L
R
The following diagrams show the most common basic system configurations using the
GTS100. More elaborate systems are formed by using a combination of these “building
blocks.” For additional ideas, refer to the “Add On and Upgrade Section” near the end
of this manual.
GTS100. More elaborate systems are formed by using a combination of these “building
blocks.” For additional ideas, refer to the “Add On and Upgrade Section” near the end
of this manual.
JBL 1394 Manual 7/17/98 11:49 AM Page 7
8
L– L+
– +
L– R+
– +
R– R+
– +
R– R+
– +
L– R+
– +
L– L+
– +
L
R
L
R
R
L– R+
– +
GTS
100
GTS
100
4-Ohm
Full-Range
Speaker or
Speaker or
Subwoofer
4-Ohm
Full-Range
Speaker or
Speaker or
Subwoofer
Application 2
Bridge-Mode Operation
Single Amplifier:
Subwoofer-Operation (Mono)
Subwoofer-Operation (Mono)
Main speakers are driven by head unit or
additional amplifier.
additional amplifier.
Preamp or
Speaker-Level
Input
L
R
2 or 4-Ohm
Full-Range
Speakers
L
R
Front
Rear
4-Ohm
Subwoofer
GTS100
A
GTS100
B
Application 3
Bi-amplified, Three-channel
Subwoofer/Satellite System.
Subwoofer/Satellite System.
Amp Crossover Input Mode Line
Switch Switch
Switch Switch
Switch
A High
Stereo
In
B Low
L + R
In
Stereo Subwoofers may be used by configuring
GTS100-B as shown in Application #1
GTS100-B as shown in Application #1
GTS100
B
GTS
100
Speaker-
Level
Input
L R
R L
2 or 4-Ohm
Full-Range
Speakers
L R
Preamp
Output
Preamp
Input
4-Ohm
Subwoofer
GTS100
B
GTS100
A
Application 4
Bi-amplified, System Using
Preamp Output Capability
Preamp Output Capability
Stereo Subwoofers may be used by configuring
GTS100-B as shown in Application #1 or
by using dual GTS100s as shown in
Application #2
GTS100-B as shown in Application #1 or
by using dual GTS100s as shown in
Application #2
Amp Crossover Input Mode Line
Switch Switch Switch
A High Stereo Out
Switch Switch Switch
A High Stereo Out
B Low L + R
In
GTS
100
GTS
100
L– R+
– +
GTS100
A
GTS
100
For Single Amplifier
Subwoofer Use
For Dual-Amplifier
Full-Range or Subwoofer Use
Preamp or
Speaker Level
Crossover
Switch
Low
Amp
B
Input Mode
Switch
L + R
Line
Switch
In
Dual Amplifier:
Subwoofer-operation (Stereo)
Subwoofer-operation (Stereo)
Full-Range Operation (Stereo)
Crossover
Switch
Low
Amp
A + B
Input Mode
Switch
R
Line
Switch
In
Crossover
Switch
Off
Amp
A + B
Input Mode
Switch
R
Line
Switch
In
JBL 1394 Manual 7/17/98 11:49 AM Page 8
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