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 Touring Series II 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.
APPLICATIONS – GTO301.1II, GTO601.1II AND GTO1201.1II
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
GTO Amplifier
(partial end panel)
GTO Amplifier
(partial end panel)
show how to configure the GTO
subwoofer amplifiers (models
+
–
–
+
+
–
GTO301.1II, GTO601.1II and GTO1201.1II).
Subwoofer
Subwoofer
Subwoofer
Figure 2. GTO subwoofer amplifier with two woofer connections.
Figure 3. GTO subwoofer amplifier with one woofer connection.
NOTE: For simplicity, Figures 2 and 3
do not show power, remote and input
connections.
NOTE: Minimum speaker load is
2 ohms.
APPLICATIONS – GTO75.2II
The JBL GTO75.2II amplifier can be
set up for stereo or bridged-mono
operation, as shown in Figures 4 and 5.
HP LP FLAT
HP LP FLAT
NOTE: For simplicity, Figures 4 and 5
do not show power, remote and input
MODE
MODE
FREQ
FREQ
connections.
GTO75.2 II
(partial end panel)
GTO75.2 II
(partial end panel)
NOTE: Minimum speaker impedance
for stereo operation is 2 ohms.
Minimum speaker impedance for
bridged operation is 4 ohms.
+
–
–
+
–
+
Subwoofer
Figure 4. GTO75.2II amplifier set up for stereo operation.
Figure 5. GTO75.2II amplifier set up for bridged-
mono operation.
3
APPLICATIONS – GTO75.4II
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
GTO75.4 II
(partial end panel)
+
–
+
bridged operation is 4 ohms.
–
Figure 6. GTO75.4II amplifier in 4-channel (stereo) operation to drive front and rear full-range speakers.
Subwoofer
+
–
GTO75.4 II
(partial end panel)
+
–
–
+
Figure 7. GTO75.4II is set up for 3-channel operation to drive a set of full-range speakers and a subwoofer.
+
–
GTO75.4 II
(partial end panel)
–
+
Figure 8. GTO75.4II used in bridged 2-channel mode to drive a set of components or subwoofers.
4
APPLICATIONS – GTO755.6II
Rear
Right
Front
Right
The GTO755.6II can be configured for
Subwoofer
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.
GTO755.6 II
(partial end panel)
–
+
–
–
+
+
NOTE: For simplicity, Figures 9 through
11 do not show power, remote and
input connections.
Subwoofer
Rear
Left
Front
Left
Figure 9. 6-Channel operation: GTO755.6II amplifier driving full-range front and rear speakers and a pair of subwoofers.
NOTE: Minimum speaker impedance
for stereo operation is 2 ohms.
Minimum speaker impedance for
bridged operation is 4 ohms.
Rear
Right
Front
Right
Subwoofer
–
+
–
+
–
+
GTO755.6 II
(partial end panel)
–
+
–
+
Rear
Left
Front
Left
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.
Subwoofer
Right
Left
+
–
–
+
–
+
GTO755.6 II
(partial end panel)
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)
SETTING INPUT
SENSITIVITY
REMOTE LEVEL CONTROL
The GTO755.6 II and all three GTO
INSTALLING NEON TUBES
(OPTIONAL)
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.”
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.
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.
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.
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.
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).
SETTING THE BASS BOOST
The GTO755.6 II, GTO301.1II, GTO601.1II and
GTO1201.1II are all equipped with a bass-
boost control. This allows you to adjust the
bass output of your system at 50Hz up to
12dB and enhance low frequency.
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.
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.
AUX OUTPUT
GTO amplifiers (except GTO755.6 II) are
equipped with full-range outputs that can
be used to connect additional amplifiers.
For subwoofers, choose the highest
frequency that removes vocal information
from the sound of the subwoofer.
NOTE: When using the high-level inputs,
the AUX outputs can be used to pass a
line-level signal to another amplifier.
7. Slide the cover back into place and re-
install 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.
If using the GTO75.2 II or GTO75.4 II to drive
a subwoofer(s), set the crossover mode to
LP (low pass).
Figure 12. Control end panel.
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.
GTO75.2 II
GTO75.4 II
GTO301.1II, GTO601.1II, GTO1201.1II
GTO75.6 II
6
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
SYMPTOM
LIKELY CAUSE
SOLUTION
No audio
(POWER LED
is off)
No voltage at BATT+
or REM terminals,
or bad or no ground
connection
Check voltages at
amplifier terminals
with VOM
No audio
(PROTECT
LED is on)
Voltage more than 16V
or less than 8.5V on
BATT+ connection
regulator
Check vehicle
charging system for
defective voltage
No audio
DC voltage on
amplifier output
Amplifier may need
service; see enclosed
warranty card for
Distorted audio
Input sensitivity is
not set properly, or
amplifier or source
unit is defective
Check INPUT
(PROTECT LED
flashes every
4 seconds)
LEVEL setting; or
check speaker wires
for shorts or grounds
service information
No audio
(PROTECT
LED is on)
Amplifier is
overheated
Make sure amplifier
cooling is not blocked
at mounting location;
verify speaker system
impedance is within
specified limits (see
“Specifications” on
the next page)
Distorted audio
and PROTECT
LED flashes
Short circuit in
speaker or wire
Remove speaker leads
one at a time to locate
shorted speaker or
wire, then repair
Check speaker
connections for
proper polarity
Music lacks
“punch”
Speakers are not
connected properly
No audio
Voltage less than 9V on
BATT+ connection
Check vehicle
charging system for
defective voltage
regulator
(PROTECT
and POWER
LEDs flash)
7
SPECIFICATIONS
GTO301.1II
GTO601.1II
GTO1201.1II
• 204W RMS x 1 channel at 4 ohms and ≤1% THD + N
• Signal-to-noise ratio: 77dBA (reference 1W into 4 ohms)
• 424W RMS x 1 channel at 4 ohms and ≤1% THD + N
• Signal-to-noise ratio: 72dBA (reference 1W into 4 ohms)
• 787W RMS x 1 channel at 4 ohms and ≤1% THD + N
• Signal-to-noise ratio: 70dBA (reference 1W into 4 ohms)
• 294W RMS x 1 channel at 2 ohms, 14.4V supply and
≤1% THD + N
• 580W RMS x 1 channel at 2 ohms, 14.4V supply and
≤1% THD + N
• 1114W 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
• Dynamic power: 778W at 2 ohms
• Effective damping factor: 6.326 at 4 ohms
• Frequency response: 10Hz – 302Hz (–3dB)
• Maximum input signal: 5.3V
• 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
• Maximum sensitivity: 75mV
• 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
• 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
• 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
GTO75.2II
GTO75.4II
GTO755.6II
• 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
• 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
• 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)
≤1% THD + N
• 290W RMS x 1 channel at 4 ohms, 14.4V supply and
≤1% THD + N
• 284W RMS x 2 channels at 4 ohms, 14.4V supply and
• 80W x 4 channels, 150W x 2 channels at 2 ohms, 14.4V
supply and ≤1% THD + N
≤1% THD + N
≤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
• Dynamic power: 190W at 2 ohms
• Effective damping factor: 6.39 at 4 ohms
• Frequency response: 10Hz – 90kHz (–3dB)
• Maximum input signal: 5.5V
• 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
• 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
• 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
• 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
Declaration of Conformity
We, Harman Consumer Group 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:
JBL Consumer Products
250 Crossways Park Drive, Woodbury, NY 11797 USA
EN 55013:2001
EN 55020:2002
© 2004 Harman International Industries, Incorporated
JBL and Grand Touring are registered trademarks
of Harman International Industries, Incorporated.
Klaus Lebherz
Harman Consumer
Group International
Part No. GTOAMPOM12/04
Specifications and appearance are
subject to change without notice.
Chateau-du-Loir, France 12/04
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