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

• Check that the amplifier’s +12V and GND connections have been properly

Power/ Protection LED is off):

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

• Check that all amplifier input and speaker connections have been properly

Power/ Protection LED is

made.

orange):

• 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

• Confirm that the vehicle’s electrical system is supplying between 9V and 16V

Power/ Protection LED is red):

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.

 

 

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Harman GTO-3EZ, GTO-5EZ owner manual Troubleshooting, Bass Boost, Power/Protection LED, Led

GTO-5EZ, GTO-3EZ specifications

The Harman GTO-3EZ and GTO-5EZ are compelling offerings from Harman's extensive range of car audio products. Both models showcase superior engineering and innovative technologies that make them standout choices for audiophiles and casual listeners alike.

Starting with the GTO-3EZ, this three-way speaker system emphasizes a balanced sound profile. It features a 3-inch polycarbonate woofer that ensures bass performance is both deep and smooth. The addition of a 1-inch textile dome tweeter enhances clarity in the high frequencies, providing a more immersive listening experience. Notably, the GTO-3EZ is designed with an integrated crossover network, enabling an accurate distribution of frequencies across the speaker components. This ensures that each driver operates efficiently within its designated frequency range, resulting in a cohesive sound stage.

The GTO-5EZ takes the performance a step further with its five-way speaker configuration. Featuring a larger 5.25-inch woofer, the GTO-5EZ excels in delivering richer bass and enhancing volume levels without distortion. Accompanied by a 1-inch soft dome tweeter, this speaker captures the intricacies of vocals and instruments, giving listeners a truly engaging experience. This model also incorporates an advanced silk dome midrange driver, providing superior mid-frequency clarity that complements both vocal and instrumental tracks.

Both models utilize Harman’s proprietary EQ settings which allow users to tailor their listening experience. This feature offers a selection of preset equalizer options, helping users achieve optimal sound depending on their personal preferences or specific musical genres. In addition, the speakers employ a robust build quality with durable materials that ensure longevity and resilience against harsh automotive environments.

The GTO-3EZ and GTO-5EZ are also designed for easy installation, featuring adaptable mounting hardware that caters to a variety of vehicle models. With a sleek aesthetic, they blend seamlessly into car interiors, enhancing the overall look without compromising on performance.

Overall, the Harman GTO-3EZ and GTO-5EZ are exemplary choices for those seeking top-notch car audio solutions. With their state-of-the-art technologies, thoughtful design, and exceptional sound quality, these speakers promise to elevate any driving experience, making each journey a melodious adventure.