Setup Procedure, Input Connections, Controls

Input Connections

Input Connectors

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	Insert	Tighten
Screw	Wire	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.

• You can use either input connector to connect a source component with a single mono subwoofer output.

Setup Procedure

GTO subwoofer 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		Gain
Control		Control
	Gain		Bass

	Indicator		Boost
	LEDs		Control

Set the Crossover

Before you set the amplifier’s gain, we recommend that you set the Crossover controls for the subwoofer. The crossover is permanently set for low-pass operation.

Crossover Control

The Crossover control determines the frequency where the low frequencies sent to the subwoofer begin to be reduced in volume.

GTO-751EZ, GTO-501EZ, GTO-1001EZ specifications

The JBL GTO series of amplifiers, including the GTO-1001EZ, GTO-501EZ, and GTO-751EZ, represents a compelling choice for audiophiles who seek enhanced audio performance in their vehicles. These amplifiers are designed to deliver powerful and clear sound quality, making them essential components for any high-fidelity car audio system.

The GTO-1001EZ is a monoblock amplifier that boasts a robust output of 1000 watts RMS at 2 ohms. This model utilizes JBL's latest technology, including True Power technology, which ensures consistent power delivery without distortion. The amplifier features a variable low-pass filter that allows users to tailor their bass response according to the type of music they prefer. Additionally, the GTO-1001EZ includes a remote gain control for easy adjustments from the driver’s seat.

The GTO-501EZ is a versatile five-channel amplifier capable of powering both speakers and subwoofers, making it an excellent choice for building a complete audio system. Offering 75 watts RMS per channel at 4 ohms for the speakers and a dedicated subwoofer channel with a peak power of 500 watts, this amplifier provides dynamic sound across all frequencies. It also incorporates high-level inputs, which facilitate seamless integration with factory audio systems. The GTO-501EZ features an advanced thermal management system to prevent overheating during extended use.

For those seeking even more power, the GTO-751EZ is a robust seven-channel amplifier designed to drive speakers and a subwoofer efficiently. With a total output of 900 watts RMS, this amplifier is perfect for large setups and can accommodate high-performance audio systems. It also comes equipped with a built-in DSP processor, allowing users to customize the sound field and frequency response to suit their preferences.

All three models feature JBL's special class D amplifier technology that helps to minimize size while maximizing output efficiency. The compact design makes installation in tight spaces a breeze. Additionally, these amplifiers utilize gold-plated terminals for improved connectivity and performance.

In summary, the JBL GTO-1001EZ, GTO-501EZ, and GTO-751EZ amplifiers stand out in the automotive audio landscape. With their powerful output, customizable features, and state-of-the-art technologies, they provide an excellent foundation for a high-quality car audio system, enhancing the listening experience for anyone who values exceptional sound quality on the road.