Harman Stereo Amplifier GTO 3EZ User Manual

GTO-5eZ/GTO-3eZ  
power amplifier  
Owner’s Manual  
 
mOunting the amplifier  
nOte: You may find it more convenient to make all of the connections to the amplifier before you permanently mount  
it to the vehicle.  
Before mounting the amplifier you must remove the two end caps to expose the mounting holes and the connections.  
Using a Phillips screwdriver, remove the attachment screws and then the end caps, as shown in the illustration. Put  
the screws in a safe place, so you can use them to reattach the end caps after you have made all the connections to  
the amplifier.  
nOte: Before you permanently mount the amplifier, read Auto Turn-On Switch, below, to determine the setting of the  
switch, which is located on the amplifier’s bottom panel.  
1. Select a suitable mounting location as described above.  
2. Using the amplifier as a template, mark the locations of the mounting holes on the mounting surface.  
3. Drill pilot holes in the mounting surface.  
4. Attach the amplifier to the mounting surface with four appropriate mounting screws of your own choice. We  
suggest using #8 Phillips-head sheet metal screws. Make sure the amplifier is mounted securely.  
cOnnecTiOns  
impOrtant: Disconnect the vehicle’s negative (–) battery terminal before beginning the installation.  
If you have not already done so, remove the two end caps that cover the amplifier’s connectors as explained in  
Mounting the Amplifier, above. This will provide easier access to all of the amplifier’s connectors.  
autO turn-On sWitch  
No remote turn-on connection is necessary because GTO amplifiers include signal-sensing turn-on, which will turn  
the amplifier on when it receives an audio signal at any of its input connectors. The amplifier will automatically turn off  
approximately five minutes after the input signal ceases.  
If your audio system’s source unit includes a remote turn-on wire and you would prefer to use it, the amplifier  
will sense that you’ve used a remote turn-on wire and that connection will override the signal-sensing turn-on. If  
necessary, you can defeat the signal-sensing turn-on circuit by moving the Auto Turn-On switch to the “Off” position.  
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cOnnecting the pOWer and grOund  
The GTO series amplifiers are capable of delivering extremely high power levels, and require a heavy-duty and  
reliable connection to the vehicle’s electrical system to achieve optimal performance. Please adhere to the following  
instructions carefully.  
using the connectors  
GTO series amplifiers use the same type of screw terminals for power and speaker connections. This type of terminal  
is easy to use, provides superior current transfer and allows the easy connection of large-gauge wire.  
To use the connectors, use a Phillips screwdriver to loosen the connector’s set screw, insert the bare wire and tighten  
the set screw to secure the wire in the connector.  
Loosen  
Screw  
Insert  
Wire  
Tighten  
Screw  
ground connection  
Connect a wire (minimum 6AWG – 13.2mm2 – for the GTO-5EZ; minimum 8AWG – 8.4mm2 – for the GTO-3EZ) from  
the amplifier’s GND terminal directly to a solid point on the vehicle’s chassis. For a good connection, use sandpaper  
to clear the paint from the metal surface at this chassis location. Use a star-type lock washer to secure the wire’s  
connection.  
Power  
Connectors  
Audio System Head Unit  
Remote Turn-On (optional)  
2
>
#18 AWG (0.82mm ) Wire  
+12V  
2
>
>
#6AWG (13.2mm ) Wire – GTO-5EZ  
2
#8AWG (8.4mm ) Wire – GTO-3EZ  
90A Fuse (GTO-5EZ)  
70A Fuse (GTO-3EZ)  
18"  
(46cm)  
Chassis Ground  
(bare metal)  
2
>
>
#6AWG (13.2mm ) Wire – GTO-5EZ  
2
#8AWG (8.4mm ) Wire – GTO-3EZ  
4
 
power connection  
1. Connect a wire (minimum 6AWG – 13.2mm2 – for the GTO-5EZ; minimum 8AWG – 8.4mm2 – for the GTO-3EZ)  
directly to the battery’s positive (+) terminal.  
2. Install a fuse holder for a 90A fuse (GTO-5EZ) or 70A fuse (GTO-3EZ) on this wire within 18" (46cm) of the  
battery’s (+) terminal. Do not install the fuse in the holder at this time.  
3. Route this wire to the amplifier’s location and connect it to the amplifier’s +12V terminal. Be sure to use  
appropriate grommets whenever routing wires through the firewall or other sheet metal. impOrtant: Failure to  
adequately protect the positive wire from potential damage may result in a vehicle fire.  
4. When you are finished routing and connecting this wire, install the appropriate fuse in the holder you installed near  
the battery. (GTO-5EZ = 90A fuse; GTO-3EZ = 70A fuse.)  
speaker cOnnectiOns  
Always connect the (+) terminal on the amplifier to the (+) terminal on the speaker and the (–) terminal on the amplifier  
to the (–) terminal on the speaker.  
Speaker  
Connectors  
Speaker  
Connectors  
GTO-5EZ  
GTO-3EZ  
impOrtant: Make sure the (+) and (–) bare wires do not touch each other or the other terminal at both the amplifier  
terminals and speaker terminals. Touching wires can cause a short circuit that can damage the amplifier.  
nOte: The minimum speaker impedance for stereo operation is 2 ohms. The minimum speaker impedance for bridged  
operation is 4 ohms. The minimum subwoofer impedance is 2 ohms.  
stereo operation  
• Connect the front speakers to the Front L (FL) and Front R (FR) (+) and (–) terminals.  
• GTO-5EZ only: Connect the rear speakers, using the RL and RR (+) and (–) terminals.  
• Connect the subwoofer to the Sub (+) and (–) terminals.  
Front Left Speaker  
Front Right Speaker  
Rear Left Speaker*  
Rear Right Speaker*  
*GTO 5EZ only  
Subwoofer  
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gtO-5eZ bridged operation (high-power for front speakers)  
• Connect the left speaker to the FL (+) and FR (–) terminals  
• Connect the right speaker to the RL (+) and RR (–) terminals.  
• Connect the subwoofer to the Sub (+) and (–) terminals.  
Left Speaker  
Right Speaker  
GTO-5EZ  
Subwoofer  
nOte: You can also run one pair of left and right channels in stereo and the other pair of left and right channels  
bridged for a 3.1-channel system.  
See Connecting the Inputs, on page 7, for information about connecting the inputs for bridged operation.  
gtO-3eZ Bridged operation (center channel and subwoofer operation in a multichannel  
system)  
• Connect one speaker to the L (+) and R (–) terminals.  
• Connect the subwoofer to the Sub (+) and (–) terminals.  
Speaker  
L
R
GTO-3EZ  
Subwoofer  
See Connecting the Inputs, on page 7, for information about connecting the inputs for bridged operation.  
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input cOnnectiOns  
The GTO-5EZ and GTO-3EZ amplifiers have multiple input connectors with routing switches that increase flexibility, so  
you can use these amps in a variety of audio system configurations.  
Front and Rear  
Input Connectors  
Sub Input  
Connector  
Front Input  
Connectors  
Sub Input  
Connector  
EZ  
GTO-5EZ  
GTO-3EZ  
Sub  
Routing  
Switch  
Front/Rear  
Sub  
Routing  
Switch  
Routing  
Switch  
rOuting sWitches  
The GTO amplifier routing switches let you determine which input connectors drive the amplifier’s various speaker  
outputs:  
gtO-5eZ  
Front/Rear Routing switch:  
• F: The front and rear speaker outputs are both fed by the Front Input connectors.  
• F&R: The front speaker outputs are fed by the Front Input connectors; the rear speaker outputs are fed by the  
Rear Input connectors.  
Sub Routing switch:  
• F&R: The Sub speaker output is fed by the Front and Rear Input connectors. (For use with source units that do not  
have a dedicated subwoofer connector.)  
• S: The Sub speaker output is fed only by the Sub Input connector. (For use with source units that have a  
dedicated subwoofer connector.)  
gtO-3eZ  
Sub Routing switch:  
• F: The Sub speaker output is fed by the Front Input connectors. (For use with source units that do not have a  
dedicated subwoofer connector.)  
• S: The Sub speaker output is fed only by the Sub Input connector. (For use with source units that have a  
dedicated subwoofer connector.)  
cOnnecting the inputs  
Use RCA audio cables to connect source units with preamp-level outputs to the amplifier; use the supplied bare wire-  
to-RCA adapters to connect to source units that don’t have RCA output connectors.  
Use a small Phillips screwdriver to loosen the adapter’s set screws and insert the speaker wires into the holes on the  
back of the adapter. Tighten the set screws to secure the wires.  
Loosen  
Screw  
Insert  
Wire  
Tighten  
Screw  
Always connect the (+) speaker wire to the (+) terminal on the adapter and the (–) speaker wire to the (–) terminal on  
the speaker.  
impOrtant: Make sure the (+) and (–) bare wires do not touch each other. Touching wires can cause a short circuit  
that can damage the source unit or the amplifier.  
When you’re finished, plug the adapter into the appropriate input connector on the amplifier.  
• For bridged operation: Connect to either the left or right input connectors if you wish to feed the amplifier a mono  
signal (such as the center channel from a processor that outputs a center channel signal), or connect to both  
inputs if you want the amplifier to create a mono signal for a single speaker.  
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seTuP PrOcedure  
GTO series amplifiers include a setup CD with test signals that makes it easy to precisely set the amplifier’s input gain  
to maximize the amplifier’s signal-to-noise and dynamic range performance with your vehicle’s audio system. The  
amplifiers feature three Gain Indicator LEDs that provide all the feedback you need to quickly set the gain to the proper  
level.  
cOntrOls  
Before setting the amplifier controls: Confirm that all connections have been correctly made, reconnect the  
vehicle’s negative (–) battery terminal and turn the audio system on.  
Crossover  
Control  
Gain  
Control  
Crossover  
Control  
Gain  
Control  
Crossover  
Control  
Gain  
Control  
Gain  
Indicator  
LEDs  
Bass  
Boost  
Control  
Crossover  
Gain  
Indicator  
LEDs  
Crossover  
Gain  
Indicator  
LEDs  
Filter  
Filter  
Selector  
Selector  
Sub Channel Controls  
Front Channel Controls  
Rear Channel Controls  
(GTO-5EZ only)  
set the crOssOver  
Before you set the amplifier’s gain, we recommend that you set the Crossover controls for the speakers that you have  
connected to each of the amplifier’s channels.  
crossover filter selector  
The Crossover Filter Selector lets you configure the front (and rear – GTO-5EZ) channels for either high-pass, low-pass  
or full-range operation. The Sub channel crossover is permanently set for low-pass operation.  
• if you have connected a subwoofer or woofer to the amplifier channels: Set the Crossover Filter selector in  
the “LP” (low-pass) position. This will limit the amount of high-frequency energy sent to the woofers or subwoofer.  
• if you have connected any other type of speaker to the amplifier channels: Set the Crossover Filter selector  
in the “HP” (high-pass) position. This will limit the amount of low-frequency energy sent to the speaker, significantly  
reducing distortion and preventing the speaker from damage. exception: If you have connected large full-range  
speakers (6" x 9" or larger) that can handle significant bass to the amplifier channels and you are not using a  
subwoofer in the system, set the Crossover Filter selector for full-range operation (the switch’s center position).  
crossover control  
The Crossover control determines the frequency where the low frequencies or high frequencies sent to the speakers  
begin to be reduced in volume.  
• high-pass operation: For high-pass filters, you should set the Crossover control according to the size of the  
speakers connected to the amplifier channels – the smaller the speakers the higher you need to set the control to  
protect the speaker from damage. The illustration below shows the acceptable crossover filter frequency ranges  
for different speaker sizes.  
6-Inch and 5-Inch  
Speakers  
4-Inch and Smaller  
Speakers  
After initially setting the crossover frequency, listen to music with strong bass that you are familiar with. If the speakers  
sound distorted or distressed, move the crossover frequency control to a higher setting to eliminate the distortion/  
distress.  
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• low-pass operation: The low-pass Crossover control setting you use for subwoofers will depend partly on the  
settings you use for the system’s high-pass channels (see above) and partly on the type and location of your  
system’s subwoofer. Start by setting the Crossover control to a frequency somewhat lower than the lowest  
setting you used on any of the high-pass channels. After listening to music on the system for a time, fine-tune the  
low-pass Crossover control setting to achieve a smooth transition from the subwoofer to the rest of the system’s  
speakers while avoiding a “hole,” where the sounds that occur between the subwoofer and other speakers seem  
to drop out. The illustration below shows the acceptable low-pass Crossover control frequency range.  
set the gain  
EZ  
GTO-5EZ  
GTO-3EZ  
Front/Rear  
Input Level  
Switch  
Gain LEDs Input Level  
Switch Switch  
Gain LEDs  
Switch  
Sub  
Input Level  
Switch  
Before beginning, make sure the Gain LEDs switch is set to the “On” position.  
1. Initially set all amplifier Input Level switches to the “Hi1” position.  
nOte: If you have connected the GTO-5EZ or GTO-3EZ amplifier to your factory audio system’s speaker outputs,  
the audio system may show a “speaker disconnected” message, or may fail to play with an amplifier connected to its  
output. If this happens, set the GTO amplifier’s Input Level switch to the “Hi2” position. The “Hi2” position includes a  
circuit designed to fool this type of factory system into “seeing” a speaker connected to its output.  
2. Turn all amplifier Gain controls to the “Min” setting.  
3. If you have connected an RBC Remote Bass Control (sold separately), set its knob to 3/4 (clockwise) before  
performing the rest of the procedure. This will allow you to use the control to boost or attenuate the subwoofer  
after you have completed setup.  
4. Play the supplied setup CD through the vehicle’s audio system.  
5. Set the audio system head unit’s volume to maximum (all the way up).  
6. SLOWLY advance the Gain control setting. The Gain Indicator LEDs will light up:  
• Yellow LED = Gain is too low  
• Green LED = Gain is OK  
• Red LED = Gain is too high  
7. SLOWLY advance the Gain control so that the green Gain Indicator LED lights up. If you overshoot and the red  
LED lights up, turn the Gain control down so that the yellow LED lights up and advance the Gain control SLOWLY  
until the green LED lights up.  
Gain too low  
(increase gain)  
Gain too high  
(decrease gain)  
Gain OK  
nOte: If you advance the Gain control all the way and the yellow LED is still lit up, turn the Gain control to “Min,”  
switch the Input Level switch to the “Low” position and repeat Step 6.  
8. Repeat Steps 5 and 6 for all of the amplifier channels. When all Gain Indicator LEDs are lit green, the GTO  
amplifier gain setup is complete.  
nOte: Set the amplifier’s Gain LEDs switch to the “Off” position to prevent the red LEDs from lighting up  
continually during normal operation.  
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Bass BOOst  
The Bass Boost control provides up to 12dB of bass boost at 45Hz. Set this control according to your personal taste,  
but be careful not to set the control at a high enough level to cause audible distortion or bottoming of your subwoofer.  
pOWer/prOtectiOn led  
Power/  
Protection  
LED  
The GTO amplifier Power/Protection LED’s color indicates the amplifier’s operational status:  
LED is orange: Normal operation (power is on)  
LED is off: Amplifier is in standby mode  
LED is red: Amplifier is in protect mode  
If the amplifier is in the protect mode (the LED is red), see Troubleshooting, below.  
TrOubleshOOTinG  
If your amplifier isn’t performing the way you think it should, check to see if the problem is covered in this section  
before calling your dealer or contacting JBL customer service.  
prOBlem  
causes and sOluTiOns  
No sound (the amplifier’s  
Power/ Protection LED is off):  
• Check that the amplifier’s +12V and GND connections have been properly  
made.  
• Check if the fuse on the +12V wire located near the battery is blown; if so,  
replace it with an identical fuse.  
• Check all amplifier fuses; if any are blown, replace them with identical fuses.  
• If you are using the amplifier’s REM connection for turn-on, check that the  
wire is properly connected to the audio system’s remote turn-on wire or to the  
vehicle’s ACC power terminal.  
• If you are using the amplifier’s Auto Turn-On circuit for turn-on, check that the  
amplifier’s Auto Turn-On switch (on the amplifier’s bottom panel) is set in the  
“On” position.  
No sound (the amplifier’s  
Power/ Protection LED is  
orange):  
• Check that all amplifier input and speaker connections have been properly  
made.  
• Check that the amplifier’s Gain controls are not turned all the way down.  
• Check that the vehicle audio system’s source unit’s volume control is not  
turned all the way down.  
No sound (the amplifier’s  
Power/ Protection LED is red):  
• Confirm that the vehicle’s electrical system is supplying between 9V and 16V  
DC to the amplifier. If the supply voltage is outside of this range, correct the  
condition before attempting to use the amplifier.  
• If the amplifier has overheated, wait until it has cooled down before attempting  
to use it again.  
• Disconnect all speakers from the amplifier and attempt to turn it on again:  
– If the amplifier turns on (the Power/Protect LED is orange), there is a short  
circuit in one or more of the speaker wires. Correct all short circuits before  
reconnecting the speakers to the amplifier.  
– If the amplifier does not turn on (the Power/Protect LED is still red), contact  
your authorized JBL dealer for assistance.  
10  
 
prOBlem  
causes and sOluTiOns  
Sound only comes from some of  
the speakers connected to the  
amplifier:  
• Check that the settings of the amplifier’s Input Routing switches match the  
input and speaker connections made to the amplifier.  
• Check that the vehicle audio system’s source unit’s balance and fader controls  
are set to their center (midpoint) positions.  
• If the subwoofer is silent and the optional Remote Bass Control is  
connected to the amplifier, check that it is not turned all the way down (fully  
counterclockwise).  
Sound is too quiet, even with the  
vehicle audio system’s head unit  
volume turned all the way up:  
• Check the amplifier’s Input Level switches. If they are set to “Hi1,” turn the  
amplifier’s Gain controls all the way down and re-set the Input Level switches  
to “Low.” Then perform the Set the Gain procedure, on page 9, again.  
Sound in the front/rear speakers  
is distorted:  
• If the amplifier channels’ Input Level switch is set in the “Low” position, change  
the setting to “Hi1” and perform the Set the Gain procedure, on page 9, again  
for those channels.  
• Make sure amplifier’s Crossover Filter selector for the distorted channels is set  
to HP.  
• Set the distorted channels’ Crossover control to a higher setting.  
• Check that the distortion is not originating from the vehicle audio system’s  
source unit.  
Sound in the subwoofer is  
distorted:  
• If the amplifier Sub channel’s Input Level switch is set in the “Low” position,  
change the setting to “Hi1” and perform the Set the Gain procedure, on page  
9, again for those channels.  
• While listening to bass-heavy music, turn the Bass Boost control all the way  
down, and then gradually increase it until the distortion begins to return.  
Reduce the Bass Boost control setting slightly to eliminate the distortion and  
leave it set there.  
• Check that the distortion is not originating from the vehicle audio system’s  
source unit.  
GTO-5EZ only: The vehicle audio  
system’s source unit’s fader  
control has no effect:  
• Make sure that the amplifier’s Front/Rear Input Routing switch is set in the  
“F&R” position.  
The vehicle audio system’s  
subwoofer volume control does  
not control the subwoofer’s  
volume:  
• Make sure that the amplifier’s Sub Input Routing switch is set in the “S”  
position.  
The amplifier’s Gain LEDs  
constantly illuminate red while  
the amplifier is operating:  
• Set the amplifier’s Gain LEDs switch in the “Off” position.  
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sPecificaTiOns  
gtO-5eZ  
Number of Channels:  
4 + 1  
Power Output (CEA 2006A):  
50W RMS x 4 channels at 4 ohms + 350W RMS x 1 channel at 4 ohms,  
14.4V DC, <1.0% THD  
75W RMS x 4 channels at 2 ohms + 500W RMS x 1 channel at 2 ohms,  
14.4V DC, <1.0% THD  
150W RMS x 2 channels bridged at 4 ohms + 500W RMS x 1 channel  
at 2 ohms, 14.4V DC, <1.0% THD  
Max Power:  
1935W: 1075W x 1 channel at 2 ohms (50Hz) + 215W x 4 channels at 2  
ohms (1kHz), 15.5V DC, 10% THD  
Frequency Response:  
20Hz – 23kHz ( 0.5dB) front and rear channels;  
10Hz – 280Hz ( 3dB) sub channel  
Crosstalk:  
> 50dB @ 1kHz  
Signal-to-Noise (@ 1W):  
Maximum Current Draw:  
Fuse Replacement:  
Dimensions (D x H x W):  
Weight:  
> 85dB  
100A  
30A x 3  
14-11/16" x 2-9/16" x 9-11/16" (373mm x 66mm x 246mm)  
11.2 lb (5.1kg)  
gtO-3eZ  
Number of Channels:  
2 + 1  
Power Output (CEA 2006A):  
50W RMS x 2 channels at 4 ohms + 350W RMS x 1 channel at 4 ohms,  
14.4V DC, <1.0% THD  
75W RMS x 2 channels at 2 ohms + 500W RMS x 1 channel at 2 ohms,  
14.4V DC, <1.0% THD  
150W RMS x 1 channel bridged at 4 ohms + 500W RMS x 1 channel at  
2 ohms, 14.4V DC, <1.0% THD  
Max Power:  
1370W: 1050W x 1 channel at 2 ohms (50Hz) + 160W x 2 channels at  
2 ohms (1kHz), 15.5V DC, 10% THD  
Frequency Response:  
Crosstalk:  
20Hz – 23kHz ( 0.5dB) front and rear channels;  
10Hz – 280Hz ( 3dB) sub channel  
> 50dB @ 1kHz  
Signal-to-Noise (@ 1W):  
Maximum Current Draw:  
Fuse Replacement:  
Dimensions (D x H x W):  
Weight:  
> 85dB  
65A  
35A x 2  
11-15/16" x 2-9/16" x 9-11/16" (302mm x 66mm x 246mm)  
9.0 lb (4.1kg)  
12  
 
HARMAN Consumer, Inc.  
8500 Balboa Boulevard, Northridge, CA 91329 USA  
© 2011 HARMAN International Industries, Incorporated. All rights reserved.  
JBL is a trademark of HARMAN International Industries, Incorporated, registered in the United States  
and/or other countries.  
Features, specifications and appearance are subject to change without notice.  
13  
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