AMPLIFIER Status Indicator Lights & Protection Circuitry

There are two status indicator lights on the input / control end of the amplifier.

1)Power(Green): lights to indicate that the amplifier is turned on and operating normally.

2)Protect(Red): Indicates that the amplifier protection circuitry has been activated to prevent product failure due to a short-circuit or a dangerously low impedance connected to the amplifier output(s). Connecting the speaker outputs to an impedance lower than 2 ohms stereo (4 ohms bridged) will cause this protection mode to activate. When this protection mode is activated, the amplifier will reduce it maximum power output to protect its circuitry, which will manifest itself as increased distortion. When the problem is corrected, the amplifier will return to normal operation.

Advanced Rollback Thermal protection Unlike conventional thermal protection

systems, which shut down an amplifier when it overheats, this system protects the amplifier by gradually reducing power output if the amplifier’s safe operating temperature is exceeded. The amplifier will continue to operate and return

to normal power output once its temperature returns to a normal range.

Low-Voltage protection:

If the car’s supply voltage drops below 10 volts, the entire amplifier will shut itself off to protect its internal circuitry. The green “Powerindicator will turn off when this occurs. The amplifier will turn back on when voltage climbs back above 10 volts. This may happen in a rapid cycle when bass-heavy program material causes a weak charging system to dip below 10 volts momentarily. If this is happening in your system, turn your audio system off and have your power wiring, ground connections and charging system inspected.

Servicing your JL Audio Amplifier

If your amplifier fails or malfunctions, please return it to your authorized JL Audio dealer so that it may be sent in to JL Audio for service. There are no user serviceable parts or fuses inside the amplifier. The unique nature of the circuitry in the JL Audio amplifiers requires specifically trained service personnel. Do not attempt

to service the amplifier yourself or through unauthorized repair facilities. This will not only void the warranty, but may result in the creation of more problems within the amplifier.

If you have any questions about the installation or setup of the amplifier not covered in this manual, please contact your dealer or technical support.

JL Audio Technical Support:

(954) 443-1100

9:00 AM – 5:30 PM (Eastern Time Zone)

Monday - Friday

SYSTEM CONFIGURATIONS

The G4500 is a flexible amplifier, well-suited for a multitude of system configurations. In this section, the most likely configurations are explained in detail.

Once you have selected your desired configuration, you can use the amplifier panel drawing on pages 18 & 19 to mark the required switch positions for easy reference.

Bi-AmpLIFIED SYSTEMS

Bi-amplified systems are defined as systems in which separate amplifier channels drive low- frequency (LF) and high-frequency (HF) speakers and are separately filtered to send appropriate frequency ranges to each speaker system.

The most common application of bi-amplification in mobile audio is to drive a subwoofer system from one or more amplifiers or channels and component speakers from separate amplifiers or channels.

The G4500 can be configured to drive a bi-amplified system by itself or with a separate subwoofer amplifier.

Bi-Amplified System with one G4500 In this configuration, channels 3&4 of the

G4500 will drive subwoofers (stereo or bridged) with low-pass filtering. Channels 1&2 will drive component speakers in stereo with high-pass filtering.

Input connection options for a bi-amplified system with one G4500 are as follows:

A)No User Adjustability:

Required: a basic source unit or processor with one pair of stereo outputs.

Input Connections: a single pair of stereo source unit outputs connected to the “CH 1 (Left)” and“CH 2 (Right)” inputs of the G4500 (select “1&2” on the “CH 3&4 Input Fromswitch.

Result: the relative level of the LF and HF channels will be determined by the G4500’s Input Sens.” settings and will not be user adjustable from the front of the vehicle.

B)Fade Subwoofer Level vs. HF Level Required: a source unit or processor with two

pairs of stereo outputs.

Input Connections: the first stereo pair source unit outputs is connected to the “CH 1 (Left)” and “CH 2 (Right)” inputs of the G4500. The second stereo pair of source unit outputs is connected to the “CH 3 (Left)” and “CH 4 (Right)” inputs (select “Discrete” on the “CH 3&4 Input From” switch).

Result: in this mode, the user has the ability to fade or control the level of the LF channels relative to the HF channels via the source unit’s fader control without exceeding the maximum clean output level set by each amplifier section’s “Input Sens.” controls.

C)Subwoofer Level Control Only:

Required: a source unit or processor with one pair of stereo outputs and dedicated subwoofer outputs.

Input Connections: the main stereo pair of source unit outputs is connected to the “CH 1 (Left)” and “CH 2 (Right)” inputs of the G4500. The source unit’s dedicated subwoofer output is connected to the “CH 3 (Left)” and “CH 4 (Right)” inputs (select “Discrete” on the “CH 3&4 Input From” switch).

Result: in this mode, the user has the ability to control the absolute level of the LF channels relative to the HF channels.

Set the “Input Sens.” in the “Channel 3 & 4 Controls” section with the source unit’s subwoofer level control set at 3/4 of full output. See Appendix A (page 14) for details.

Crossover Setup for Bi-Amplified System with one G4500:

Once the input sections have been configured appropriately, go to the “Channel 3 & 4 Controls”. Select “LP(low-pass) on the “Filter Mode” switch and an appropriate “Filter Freq.(80 Hz is a good starting point).

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JL Audio G4500 owner manual System Configurations

G4500 specifications

JL Audio's G4500 is a powerful and versatile amplifier designed for audio enthusiasts who seek high-quality sound and performance in a compact format. This amplifier is part of JL Audio's GD Series, which emphasizes efficiency and durability while delivering exceptional audio fidelity. The G4500 is particularly popular among car audio enthusiasts, as it offers the ability to drive a range of speaker setups with ease.

One of the standout features of the G4500 is its Class D amplification technology. This technology allows the amplifier to produce a significant amount of power while maintaining high levels of efficiency. The Class D design results in less heat generation and reduces the need for extensive cooling, allowing for a compact form factor without compromising performance. With a power output of 75 watts RMS per channel at 4 ohms and up to 150 watts RMS at 2 ohms, the G4500 is well-equipped to power various speaker configurations effectively.

Additionally, the G4500 incorporates advanced signal processing features that enhance its versatility. The amplifier includes a built-in high-pass and low-pass filter, allowing users to tailor the sound to their specific preferences and installation requirements. The crossover settings can be adjusted to ensure that the right frequencies reach each speaker, resulting in a more balanced audio experience.

Another notable characteristic of the G4500 is its robust construction. The amplifier features a durable chassis designed to withstand the rigors of automotive environments, including vibrations and temperature variations. This durability ensures long-lasting performance, making the G4500 a reliable choice for both casual listeners and serious audiophiles.

Moreover, the G4500 includes multiple input options, including high-level inputs for connecting directly to factory-installed radios or low-level RCA inputs for aftermarket head units. This flexibility makes it suitable for a wide variety of audio systems, simplifying integration into existing setups.

In summary, the JL Audio G4500 is a compact yet powerful amplifier that offers a range of advanced features designed to enhance audio quality and performance. With its efficient Class D architecture, adjustable crossover capabilities, durable construction, and versatile input options, the G4500 is an excellent choice for anyone looking to elevate their audio experience, whether in a car, marine environment, or even for home audio systems.