GRAND
®
TOURING
SERIES II
gto75.2 II
gto75.4 II
gto755.6 II
gto301.1 II
gto601.1 II
gto1201.1 II
car audio
power amplifier
owner’s manual
THANK YOU
for purchasing a JBL Grand T
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.
ouring
®
Series II amplifier
.
INSTALLATION
GTO75.2
II
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 II 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.
Figure 1. Terminal connection end plate.
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
Failure to adequately protect the
metal.
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 GTO75.2II, GTO75.4II and GTO755.6 II
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
II,
GTO601.1II and GTO1201.1II 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
II 34A #8 AWG
GTO75.2
GTO75.4II 85A #8 AWG
GTO755.6II 87A #8 AWG
II 40A #8 AWG
GTO301.1
II 69A #6 AWG
GTO601.1
GTO1201.1II 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).
2
APPLICATIONS – GTO301.1 II, GTO601.1 II AND GTO1201.1 II
GTO Amplifier
(partial end panel)
Subwoofer
–
+
FREQ
MODE
HP LP FLAT
GTO75.2 II
(partial end panel)
+
–
Subwoofer
GTO Amplifier
(partial end panel)
Subwoofer Subwoofer
+
–
–
+
FREQ
MODE
HP LP FLAT
+
–
–
+
GTO75.2 II
(partial end panel)
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.
show how to configure the GTO
subwoofer amplifiers (models
GTO301.1
II, GTO601.1II and GTO1201.1 II).
Figures 2 and 3
NOTE: For simplicity, Figures 2 and 3
Figure 2. GTO subwoofer amplifier with two woofer connections.
do not show power, remote and input
connections.
NOTE: Minimum speaker load is
2 ohms.
APPLICATIONS – GTO75.2 II
The JBL GTO75.2II 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.
Figure 4. GTO75.2II amplifier set up for stereo operation.
Figure 3. GTO subwoofer amplifier with one woofer connection.
Figure 5. GTO75.2II amplifier set up for bridged-
mono operation.
3
APPLICATIONS – GTO75.4 II
GTO75.4 II
(partial end panel)
–
+
–
+
–
+
–
+
–
+
–
+
–
+
GTO75.4 II
(partial end panel)
S
ubwoofer
–
+
–
+
GTO75.4 II
(partial end panel)
The GTO75.4II 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. GTO75.4II amplifier in 4-channel (stereo) operation to drive front and rear full-range speakers.
Figure 7. GTO75.4II is set up for 3-channel operation to drive a set of full-range speakers and a subwoofer.
Figure 8. GTO75.4II used in bridged 2-channel mode to drive a set of components or subwoofers.
4
Subwoofer Right Left
–
+
+
–
+
–
GTO755.6 II
(partial end panel)
APPLICATIONS – GTO755.6 II
Subwoofer
–
+
–
+
+
–
+
–
+
–
+
–
GTO755.6 II
(partial end panel)
S
ubwoofer
Rear
Right
Front
Right
R
ear
L
eft
F
ront
L
eft
S
ubwoofer
R
ear
R
ight
F
ront
R
ight
Rear
Front
–
+
–
+
+
–
+
–
+
–
GTO755.6 II
(partial end panel)
The GTO755.6II can be configured for
6-channel, 5-channel or 3-channel
operation, as shown in
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.
Figures 9
Figure 9. 6-Channel operation: GTO755.6II amplifier driving full-range front and rear speakers and a pair of subwoofers.
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: GTO755.6II amplifier configured for 3-channel operation, where all of the channels are
bridged for a subwoofer and a pair of component speakers.
5
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 II or GTO75.4II
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
II or GTO75.4 II to drive
a subwoofer(s), set the crossover mode to
LP (low pass).
NOTE: The GTO301.1II, GTO601.1II,
GTO1201.1II and the subwoofer output of
the GTO755.6 II 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.
Figure 12. Control end panel.
REMOTE LEVEL CONTROL
The GTO755.6 II 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 II, GTO301.1II, GTO601.1II and
GTO1201.1II 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 II) 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.
II
GTO75.2
GTO75.4 II
GTO301.1II, GTO601.1II, GTO1201.1II
GTO75.6 II
6
INSTALLATION AND SETUP
To Neon
P
ower
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
7
SPECIFICATIONS
GTO301.1II
• 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: 75mV
• Output regulation: .098dB at 4 ohms
• Dimensions (L x W x H): 11-5/8" x 12-5/16" x 2-3/8"
• Fuse rating: 1 x 30A
GTO75.2 II
• 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: 75mV
• Output regulation: .098dB at 4 ohms
• Dimensions (L x W x H): 11-5/8" x 12-5/16" x 2-3/8"
• Fuse rating: 1 x 30A
Declaration of Conformity
GTO601.1II
• 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: 75mV
• Output regulation: .21dB at 4 ohms
• Dimensions (L x W x H): 15-1/8" x 12-5/16" x 2-3/8"
• Fuse rating: 2 x 30A
GTO75.4 II
• 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: 75mV
• Output regulation: .069dB at 4 ohms
• Dimensions (L x W x H): 15-1/8" x 12-5/16" x 2-3/8"
• Fuse rating: 2 x 30A
GTO1201.1II
• 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: 75mV
• Output regulation: .14dB at 4 ohms
• Dimensions (L x W x H): 18-11/16" x 12-5/16" x 2-3/8"
• Fuse rating: 3 x 40A
GTO755.6 II
• 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: 75mV
• Output regulation: .042dB at 4 ohms
• Dimensions (L x W x H): 18-11/16" x 12-5/16" x 2-3/8"
• Fuse rating: 2 x 30A
Harman Consumer Group International
e,
W
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
Klaus Lebherz
Harman Consumer
Group International
Chateau-du-Loir, France 12/04
Specifications and appearance are
subject to change without notice.
JBL Consumer Products
250 Crossways Park Drive, Woodbury, NY 11797 USA
© 2004 Harman International Industries, Incorporated
JBL and Grand T
ouring are registered trademarks
of Harman International Industries, Incorporated.
Part No. GTOAMPOM12/04
www.jbl.com
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