car audio
power amplifier
owner’s manual
THANK YOU
for purchasing a JBL Grand Touring®Series amplifier.
In order that we may better serve you should you
require warranty service for your new amplifier, please
retain your original purchase receipt and return the
enclosed warranty registration card.
INSTALLATION
2
WARNING: Playing loud music in an
automobile can hinder your ability to hear
traffic and permanently damage your
hearing. We recommend listening at low or
moderate levels while driving your car. JBL
accepts no liability for hearing loss, bodily
injury or property damage resulting from
the use or misuse of this product.
IMPORTANT: To get the best
performance from your JBL Grand Touring
®
Series amplifiers, we strongly recommend
that installation be entrusted to a qualified
professional. Although these instructions
explain how to install GTO amplifiers in a
general sense, they do not show specific
installation methods that may be required
for your particular vehicle. If you do not
have the necessary tools or experience,
do not attempt the installation yourself.
Instead, please ask your authorized JBL
car audio dealer about professional
installation.
INSTALLATION
WARNINGS AND TIPS
• Always wear protective eyewear when
using tools.
• Turn off the audio system and other
electrical devices before you start.
Disconnect the (–) negative lead from
your vehicle’s battery.
• Check clearances on both sides of
a planned mounting surface before
drilling any holes or installing any
screws. Remember that the screws
can extend behind the surface.
• 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.
• Before drilling or cutting holes, use a
utility knife to remove unwanted fabric
or vinyl to keep material from snagging
in a drill bit.
• When routing cables, keep input-signal
cables away from power cables and
speaker wires.
• When making connections, make
certain they are secure and properly
insulated.
• If the amplifier’s fuse must be replaced,
use only the same type and rating as
that of the original. Do not substitute
another kind.
CHOOSING A LOCATION
AND MOUNTING THE
AMPLIFIER
Choose a mounting location in the trunk
or cargo area where the amplifier will not
be damaged by shifting cargo. Amplifier
cooling is essential for proper amplifier
operation. If the amplifier is to be installed
in an enclosed space, make sure there is
sufficient air circulation for the amplifier
to cool itself.
When mounting the amplifier under a
seat, ensure that it is clear of all moving
seat parts and does not affect the seat
adjustments. Mount the amplifier so it
is not damaged by the feet of backseat
passengers. Make sure that the amplifier
is mounted securely using nuts and bolts
or the supplied mounting screws.
Mount the amplifier so that it remains
dry – never mount an amplifier outside
the vehicle or in the engine compartment.
POWER CONNECTIONS
The GTO amplifiers are capable of
delivering extremely high power levels,
and require a heavy-duty and reliable
connection to the vehicle’s electrical system
in order to perform optimally. See Figure 1
for connection location. Please adhere to
the following instructions carefully:
Ground Connection
Connect the amplifier’s Ground (GND)
terminal to a solid point on the vehicle’s
metal chassis, as close to the amplifier
as possible. Refer to the chart below to
determine minimum wire-gauge size. Scrape
away any paint from this location; use a startype lock washer to secure the connection.
Power Connection
Connect a wire (see chart at right for
appropriate gauge) directly to the vehicle’s
positive battery terminal, and install an
appropriate fuse holder within 18" of the
battery terminal. Do not install the fuse at
this time. Route the wire to the amplifier’s
location, and connect it to the amplifier’s
Positive (+12V) terminal. Be sure to use
appropriate grommets whenever routing
wires through the firewall or other sheet
metal. Failure to adequately protect the
positive wire from potential damage may
result in a vehicle fire. When you are done
routing and connecting this wire, you may
install the fuse at the battery.
Remote Connection
Connect the amplifier’s Remote (REM)
terminal to the source unit’s Remote TurnOn lead using a minimum of 18-gauge wire.
NOTE: When using the speaker level
inputs, connect the remote (REM) terminal
to the source unit. If your source unit does
not have a remote turn-on connection,
connect the amplifier’s (REM) terminal to
the vehicle’s accessory circuit.
Speaker Connections
Refer to the application guides on the
pages that follow. Speaker connections
should be made using a minimum of
16-gauge wire.
High-Level Input Connections
The GTO75.2, GTO75.4 and GTO755.6
amplifiers are equipped with speaker-level
inputs that allow you to add an amplifier
to head units that do not have RCA line
outputs. The speaker outputs for the
source unit should be connected to the
amplifier using the supplied connector
(square four-wire plug). Remember to
check for proper polarity. The GTO301.1,
GTO601.1 and GTO1201.1 amplifiers are
not equipped with high-level inputs.
NOTE: When using the high-level inputs,
the AUX outputs can be used to pass a
line-level signal to another amplifier.
Wire Gauge Chart
Amplifier Maximum Minimum
Model Current Draw Wire Gauge
GTO75.2 34A #8 AWG
GTO75.4 85A #8 AWG
GTO755.6 87A #8 AWG
GTO301.1 40A #8 AWG
GTO601.1 69A #6 AWG
GTO1201.1 115A #4 AWG
These recommendations assume 7' – 10'
wire runs. If your installation differs markedly, you will need to adjust the wire
gauge accordingly.
IMPORTANT NOTE: If you are planning
to use optional neon tubes, install them
before making any electrical connections
to the amplifier (refer to“Installing Neon
Tubes” on page 6).
Figure 1. Terminal connection end plate.
APPLICATIONS – GTO301.1, GTO601.1 AND GTO1201.1
The GTO subwoofer amplifiers are
single-channel amplifiers. There are
two sets of terminals to make it easy
to connect multiple woofers. Either
set of (+/–) terminals may be used
when connecting woofers.
To the right are two application
diagrams to help plan your subwoofer
system installation. Figures 2 and 3
show how to configure the GTO
subwoofer amplifiers (models
GTO301.1, GTO601.1 and GTO1201.1).
NOTE: For simplicity, Figures 2 and 3
do not show power, remote and input
connections.
NOTE: Minimum speaker load is
2 ohms.
3
GTO Amplifier
(partial end panel)
Subwoofer
–
+
FREQ
MODE
HP LP FLAT
GTO75.2
(partial end panel)
+
–
GTO Amplifier
(partial end panel)
Subwoofer Subwoofer
+
–
–
+
Figure 2. GTO subwoofer amplifier with two woofer connections.
Figure 3. GTO subwoofer amplifier with one woofer connection.
Figure 4. GTO75.2 amplifier set up for stereo operation.
Figure 5. GTO75.2 amplifier set up for bridged-
mono operation.
APPLICATIONS – GTO75.2
The JBL GTO75.2 amplifier can be
set up for stereo or bridged-mono
operation, as shown in
Figures 4 and 5.
NOTE: For simplicity, Figures 4 and 5
do not show power, remote and input
connections.
NOTE: Minimum speaker impedance
for stereo operation is 2 ohms.
Minimum speaker impedance for
bridged operation is 4 ohms.
GTO75.2
(partial end panel)
FREQ
MODE
HP LP FLAT
+
–
–
+
4
APPLICATIONS – GTO75.4
The GTO75.4 can be set up for stereo
4-channel, 3-channel or bridged
2-channel operation, as shown in
Figures 6 through 8.
NOTE: For simplicity, Figures 6 through
8 do not show power, remote and input
connections.
NOTE: Minimum speaker impedance
for stereo operation is 2 ohms.
Minimum speaker impedance for
bridged operation is 4 ohms.
–
+
–
+
–
+
–
+
Figure 6. GTO75.4 amplifier in 4-channel (stereo) operation to drive front and rear full-range speakers.
–
+
–
+
–
+
Figure 7. GTO75.4 is set up for 3-channel operation to drive a set of full-range speakers and a subwoofer.
–
+
–
+
Figure 8. GTO75.4 used in bridged 2-channel mode to drive a set of components or subwoofers.
Subwoofer Rear Front
–
+
+
–
+
–
5
APPLICATIONS – GTO755.6
The GTO755.6 can be configured for
6-channel, 5-channel or 3-channel
operation, as shown in Figures 9
through 11.
INPUT MODE switch:
• Use INT (internal mode) to send a
signal from the front and rear inputs
to the subwoofer.
• Use EXT (external mode) when
sending a dedicated signal to the
subwoofer inputs; e.g., if your source
unit has a subwoofer output.
NOTE: For simplicity, Figures 9 through
11 do not show power, remote and
input connections.
NOTE: Minimum speaker impedance
for stereo operation is 2 ohms.
Minimum speaker impedance for
bridged operation is 4 ohms.
Subwoofer Rear Front
Subwoofer Rear Front
–
+
–
+
+
–
+
–
+
–
+
–
Figure 9. 6-Channel operation: GTO755.6 amplifier driving full-range front and rear speakers and a pair of subwoofers.
Subwoofer Rear Front
Rear Front
–
+
–
+
+
–
+
–
+
–
Figure 10. 5-Channel operation: The same as Figure 9, with the subwoofer output bridged to drive a single 4-ohm subwoofer,
providing the speaker with more power.
Figure 11. 3-Channel operation: GTO755.6 amplifier configured for 3-channel operation, where all of the channels are
bridged for a subwoofer and a pair of component speakers.
6
INSTALLATION AND SETUP
SETTING THE
CROSSOVER(S)
Determine your system plans and set the
crossover mode switch accordingly. If you
plan to use the GTO75.2 or GTO75.4 to drive
full-range speakers, set the crossover
mode to FLAT and skip to “Setting Input
Sensitivity.”
Initially set the crossover frequency
control midway. While listening to music,
adjust the crossover for the least
perceived distortion from the speakers,
allowing them to reproduce as much
bass as possible.
Systems using a separate subwoofer set
the crossover mode to HP (high pass) for
your full-range speakers. Adjust the
crossover frequency to limit bass and
provide increased system volume with
less distortion.
For subwoofers, choose the highest
frequency that removes vocal information
from the sound of the subwoofer.
If using the GTO75.2 or GTO75.4 to drive a
subwoofer(s), set the crossover mode to
LP (low pass).
NOTE: The GTO301.1, GTO601.1, GTO1201.1
and the subwoofer output of the GTO755.6
are low-pass only and do not have a
crossover mode switch.
SETTING INPUT
SENSITIVITY
1. Initially turn the INPUT LEVEL control(s)
to minimum (counter clockwise).
2. Reconnect the (–) negative lead to the
vehicle’s battery. Apply power to the
audio system and play a dynamic music
track.
3. On the source unit, increase the volume
control to 3/4 volume. Slowly increase
the INPUT LEVEL control(s) toward three
o’clock until you hear slight distortion
in the music. Then reduce the INPUT
LEVEL slightly until distortion is no
longer heard.
NOTE: After the source unit is on, red LEDs
(on the top panel) will light, indicating the
amplifier is on. If not, check the wiring,
especially the remote connection from the
source unit. Also refer to “Troubleshooting”
on the next page.
REMOTE LEVEL CONTROL
The GTO755.6 and all three GTO subwoofer
amplifiers have inputs for an optional
remote level control (RLC). This will allow
the amplifier’s input level to be adjusted
from the listening position. Connect the
optional remote level control using the
RJ-11 jack on the side of the amplifier.
Install the control module in the front of
the vehicle within easy reach of the driver.
Under the dash or in the center console
are both suitable locations.
SETTING THE BASS BOOST
The GTO755.6, GTO301.1, GTO601.1 and
GTO1201.1 are all equipped with a bassboost control. This allows you to adjust the
bass output of your system at 50Hz up to
12dB and enhance low frequency.
AUX OUTPUT
GTO amplifiers (except GTO755.6) are
equipped with full-range outputs that can
be used to connect additional amplifiers.
NOTE: When using the high-level inputs,
the AUX outputs can be used to pass a
line-level signal to another amplifier.
INSTALLING NEON TUBES
(OPTIONAL)
1. Using a Phillips screwdriver, remove all
screws on the amplifier’s output/power
end panel and set them aside.
2. Using a 3⁄ 32-inch Allen wrench, remove
only the screws on the amplifier’s (top)
clear cover and set them aside.
3. Remove the end panel and slide the
cover off. Set both parts aside.
4. Locate the enclosed hardware bag and
remove the four clips. Each clip has a
square end and a larger round end.
Using a round end, press two clips onto
each neon tube (e.g., Street Glow AN9
or equivalent), as shown in Figure 13.
5. For each tube, align both clips so the
square ends slide onto an exposed
extrusion edge, as shown in Figure 9.
Do not cover any screw holes. When
installed correctly, each neon tube will
sit under an extrusion and not be visible
when viewed from directly above.
6. Route each neon tube’s power cable
through its respective NEON hole on the
end panel (see Figure 13).
7. Slide the cover back into place and reinstall its screws. Then, replace the end
panel and reinstall its screws.
8. Finish the installation of the neon tubes
as instructed in their owner’s manual.
Figure 12. Control end panel.
GTO75.2
GTO75.4
GTOB300.1/600.1/1200.1
GTO75.6
7
INSTALLATION AND SETUP
To Neon
Power
Supply
To Neon
Power
Supply
Figure 13. Installing neon tubes in a JBL GTO amplifier.
TROUBLESHOOTING
SYMPTOM LIKELY CAUSE SOLUTION
No audio No voltage at BATT+ Check voltages at
(POWER LED or REM terminals, amplifier terminals
is off) or bad or no ground with VOM
connection
No audio DC voltage on Amplifier may need
(PROTECT LED amplifier output service; see enclosed
flashes every warranty card for
4 seconds) service information
No audio Amplifier is Make sure amplifier
(PROTECT overheated cooling is not blocked
LED is on) at mounting location;
verify speaker system
impedance is within
specified limits (see
“Specifications” on
the next page)
No audio Voltage less than 9V on Check vehicle
(PROTECT BATT+ connection charging system for
and POWER defective voltage
LEDs flash) regulator
SYMPTOM LIKELY CAUSE SOLUTION
No audio Voltage more than 16V Check vehicle
(PROTECT or less than 8.5V on charging system for
LED is on) BATT+ connection defective voltage
regulator
Distorted audio Input sensitivity is Check INPUT
not set properly, or LEVEL setting; or
amplifier or source check speaker wires
unit is defective for shorts or grounds
Distorted audio Short circuit in Remove speaker leads
and PROTECT speaker or wire one at a time to locate
LED flashes shorted speaker or
wire, then repair
Music lacks Speakers are not Check speaker
“punch” connected properly connections for
proper polarity
GTO301.1
• 204W RMS x 1 channel at 4 ohms and ≤1% THD + N
• Signal-to-noise ratio: 77dBA (reference 1W into 4 ohms)
• 294W RMS x 1 channel at 2 ohms, 14.4V supply and
≤1% THD + N
• Dynamic power: 320W at 2 ohms
• Effective damping factor: 6.39 at 4 ohms
• Frequency response: 10Hz – 302Hz (–3dB)
• Maximum input signal: 4.7V
• Maximum sensitivity: 220mV
• Output regulation: .098dB at 4 ohms
• Dimensions (L x W x H): 11-5/8" x 12-5/16" x 2-3/8"
GTO601.1
• 424W RMS x 1 channel at 4 ohms and ≤1% THD + N
• Signal-to-noise ratio: 72dBA (reference 1W into 4 ohms)
• 580W RMS x 1 channel at 2 ohms, 14.4V supply and
≤1% THD + N
• Dynamic power: 778W at 2 ohms
• Effective damping factor: 6.326 at 4 ohms
• Frequency response: 10Hz – 302Hz (–3dB)
• Maximum input signal: 5.3V
• Maximum sensitivity: 210mV
• Output regulation: .21dB at 4 ohms
• Dimensions (L x W x H): 15-1/8" x 12-5/16" x 2-3/8"
GTO1201.1
• 787W RMS x 1 channel at 4 ohms and ≤1% THD + N
• Signal-to-noise ratio: 70dBA (reference 1W into 4 ohms)
• 1114W RMS x 1 channel at 2 ohms, 14.4V supply and
≤1% THD + N
• Dynamic power: 1339W at 2 ohms
• Effective damping factor: 6.348 at 4 ohms
• Frequency response: 10Hz – 302Hz (–3dB)
• Maximum input signal: 6.1V
• Maximum sensitivity: 140mV
• Output regulation: .14dB at 4 ohms
• Dimensions (L x W x H): 18-11/16" x 12-5/16" x 2-3/8"
GTO75.2
• 97W RMS x 2 channels at 4 ohms and ≤1% THD + N
• Signal-to-noise ratio: 82dBA (reference 1W into 4 ohms)
• 145W RMS x 2 channels at 2 ohms, 14.4V supply and
≤1% THD + N
• 290W RMS x 1 channel at 4 ohms, 14.4V supply and
≤1% THD + N
• Dynamic power: 190W at 2 ohms
• Effective damping factor: 6.39 at 4 ohms
• Frequency response: 10Hz – 90kHz (–3dB)
• Maximum input signal: 5.5V
• Maximum sensitivity: 230mV
• Output regulation: .098dB at 4 ohms
• Dimensions (L x W x H): 11-5/8" x 12-5/16" x 2-3/8"
GTO75.4
• 104W RMS x 4 channels at 4 ohms and ≤1% THD + N
• Signal-to-noise ratio: 80dBA (reference 1W into 4 ohms)
• 142W RMS x 4 channels at 2 ohms, 14.4V supply and
≤1% THD + N
• 284W RMS x 2 channels at 4 ohms, 14.4V supply and
≤1% THD + N
• Dynamic power: 163W at 2 ohms
• Effective damping factor: 6.384 at 4 ohms
• Frequency response: 10Hz – 83kHz (–3dB)
• Maximum input signal: 5.8V
• Maximum sensitivity: 230mV
• Output regulation: .069dB at 4 ohms
• Dimensions (L x W x H): 15-1/8" x 12-5/16" x 2-3/8"
GTO755.6
• 60W x 4 channels and 107W x 2 channels, at 4 ohms and
≤1% THD + N
• Signal-to-noise ratio: 79dBA (reference 1W into 4 ohms)
• 80W x 4 channels, 150W x 2 channels at 2 ohms, 14.4V
supply and ≤1% THD + N
• 160W x 2 channels, 300W x 1 channel at 4 ohms, 14.4V
supply and ≤1% THD + N
• Dynamic power: 117W (channels 1, 2, 3, 4);
163W (channels 5, 6) into 2 ohms
• Effective damping factor: 6.392 at 4 ohms
• Frequency response: 10Hz – 47kHz (channels 1, 2, 3, 4);
10Hz – 302Hz (channels 5, 6)
• Maximum input signal: 6V
• Maximum sensitivity: 250mV
• Output regulation: .042dB at 4 ohms
• Dimensions (L x W x H): 18-11/16" x 12-5/16" x 2-3/8"
SPECIFICATIONS
Declaration of Conformity
We, Harman Consumer International
2, route de Tours
72500 Chateau-du-Loir
France
declare in own responsibility that the product
described in this owner’s manual is in compliance
with technical standards:
EN 55013:2001
EN 55020:2002
Emmanuel Millot
Harman Consumer
International
Chateau-du-Loir, France 1/04
JBL Consumer Products
250 Crossways Park Drive, Woodbury, NY 11797 USA
© 2004 Harman International Industries, Incorporated
JBL and Grand Touring are registered trademarks
of Harman International Industries, Incorporated.
Part No. GTOAMPOM1/04
www.jbl.com
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