JBL GTO755 6 User Manual

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.  
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  
GTO Amplifier  
(partial end panel)  
GTO Amplifier  
(partial end panel)  
+
+
+
GTO301.1, GTO601.1 and GTO1201.1).  
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 – GTO75.2  
The JBL GTO75.2 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  
FREQ  
MODE  
FREQ  
connections.  
GTO75.2  
(partial end panel)  
GTO75.2  
(partial end panel)  
NOTE: Minimum speaker impedance  
for stereo operation is 2 ohms.  
Minimum speaker impedance for  
bridged operation is 4 ohms.  
+
+
+
Figure 4. GTO75.2 amplifier set up for stereo operation.  
Figure 5. GTO75.2 amplifier set up for bridged-  
mono operation.  
3
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.  
4
APPLICATIONS – GTO755.6  
Subwoofer  
Rear  
Front  
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.  
Subwoofer  
Rear  
Front  
Figure 9. 6-Channel operation: GTO755.6 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.  
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.  
Subwoofer  
Rear  
Front  
+
+
+
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.  
5
INSTALLATION AND SETUP  
SETTING THE  
CROSSOVER(S)  
SETTING INPUT  
SENSITIVITY  
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.  
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 332-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).  
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.”  
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.  
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.  
SETTING THE BASS BOOST  
The GTO755.6, GTO301.1, GTO601.1 and  
GTO1201.1 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) 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 or GTO75.4 to drive a  
subwoofer(s), set the crossover mode to  
LP (low pass).  
Figure 12. Control end panel.  
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.  
GTO75.2  
GTO75.4  
GTOB300.1/600.1/1200.1  
GTO75.6  
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  
GTO301.1  
GTO601.1  
GTO1201.1  
• 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  
• Dynamic power: 778W at 2 ohms  
• Dynamic power: 1339W at 2 ohms  
• Effective damping factor: 6.348 at 4 ohms  
• Frequency response: 10Hz – 302Hz (–3dB)  
• Maximum input signal: 6.1V  
• Effective damping factor: 6.39 at 4 ohms  
• Frequency response: 10Hz – 302Hz (–3dB)  
• Maximum input signal: 4.7V  
• Effective damping factor: 6.326 at 4 ohms  
• Frequency response: 10Hz – 302Hz (–3dB)  
• Maximum input signal: 5.3V  
• Maximum sensitivity: 220mV  
• Maximum sensitivity: 210mV  
• Maximum sensitivity: 140mV  
• Output regulation: .098dB at 4 ohms  
• Dimensions (L x W x H): 11-5/8" x 12-5/16" x 2-3/8"  
• Output regulation: .21dB at 4 ohms  
• Dimensions (L x W x H): 15-1/8" x 12-5/16" x 2-3/8"  
• 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  
GTO75.4  
GTO755.6  
• 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  
• Dynamic power: 190W at 2 ohms  
1% THD + N  
• Dynamic power: 163W at 2 ohms  
• 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  
• 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"  
• 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"  
• 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"  
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:  
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.  
Emmanuel Millot  
Harman Consumer  
International  
Part No. GTOAMPOM1/04  
Chateau-du-Loir, France 1/04  

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