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The low-pass Crossover control setting you use for your subwoofer will depend partly on the system’s high-pass channel settings, 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

Gain LEDs Switch

Input Level Switch

Before beginning, make sure the Gain LEDs switch is set to the “On” position.

1. Initially set the Input Level switch to the “Hi1” position.

NOTE: If you have connected the GTO subwoofer 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 the 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

Gain too high

Gain OK

(increase gain)

(decrease gain)

 

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.When the amplifier’s Gain Indicator LED is lit green, the GTO amplifier gain setup is complete.

NOTE: Set the amplifier’s Gain LED switch to the “Off” position to prevent the red LEDs from lighting up continually during normal operation.

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JBL GTO-501EZ, GTO-1001EZ, GTO-751EZ owner manual Set the Gain
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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.
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