INSTALLATION AND SETUP

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

To Neon

Power

Supply

To Neon

Power

Supply

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

Page 7
Image 7
JBL gto75.2 II, gto755.6 II, gto75.4 II, gto601.1 II, gto1201.1 II, gto301.1 II Troubleshooting, Symptom Likely Cause Solution

gto1201.1 II, gto301.1 II, gto75.4 II, gto75.2 II, gto755.6 II specifications

JBL, a brand synonymous with high-quality audio solutions, offers a range of amplifiers that cater to both casual listeners and audiophiles alike. Among their renowned products are the JBL GTO601.1 II, GTO75.4 II, GTO301.1 II, GTO75.2 II, and GTO755.6 II amplifiers. Each model embodies JBL's commitment to delivering powerful performance, refined sound quality, and advanced technologies.

The JBL GTO601.1 II is a mono subwoofer amplifier that boasts an impressive output of 600 watts RMS. This model features a unique Pulse Width Modulation (PWM) technology that provides high efficiency for maximum power delivery while promoting thermal stability. Ideal for driving large subwoofers, the GTO601.1 II is equipped with an adjustable low-pass filter, bass boost, and adjustable input sensitivity, allowing users to tailor the sound to their preferences.

The GTO75.4 II is a versatile 4-channel amplifier designed for both clarity and power. It outputs 75 watts RMS per channel at 4 ohms, enabling it to drive multiple speakers with ease. The High-Level Inputs with Auto Turn-On make installation straightforward, while the built-in crossover allows for precise control over the frequency ranges directed to each speaker. This model is ideal for those looking to upgrade their car’s audio system without sacrificing sound quality.

For those seeking a reliable and powerful mono amplifier, the GTO301.1 II offers a robust 300 watts RMS, perfect for driving subwoofers. Featuring a compact design, it blends seamlessly into varied setups while providing minimal distortion and maximum clarity thanks to its MOSFET power supply. The GTO301.1 II supports adjustable low-pass and bass boost features, ensuring every bass note is felt as much as heard.

In the 2-channel category, the GTO75.2 II stands out with its 75 watts RMS per channel output. This model combines lightweight design with high efficiency, making it suitable for powering speakers in both cars and boats. It features a built-in crossover and is engineered to minimize noise and distortion, delivering precise sound with rich overtones.

Finally, there's the GTO755.6 II, a 6-channel amplifier that provides flexibility and power, outputting 75 watts RMS per channel at 4 ohms. This model is perfect for larger audio systems requiring multiple speaker connections. Its Class D topology ensures high efficiency and low heat generation, making it a reliable choice for extended listening sessions. Additionally, the GTO755.6 II includes a variable high/low-pass crossover, allowing fine-tuning of sound for any setup.

Each of these amplifiers from JBL reflects the brand's dedication to quality and performance, ensuring that users can experience their music with the depth and intensity it deserves. Whether it's for daily listening or full-fledged audiophile setups, JBL's GTO series amplifiers set the standard in automotive audio.