and high frequency transducers in a high quality system, we recommend you use either a high quality active crossover such as JBL’s GTX47, GTX4 or GTX2 to provide optimum matching to your subwoofer or woofer/midbass loudspeaker. If you prefer passive crossovers, we recommend that you use only high quality audiophile grade film-type capacitors

and Low DCR inductors to get the most out of your system. The most popular system configuration is a hybrid using an active crossover for the subwoofer to woofer/midrange crossover point, and a passive crossover for the woofer/midrange to tweeter crossover. Your GTi Competition Series Dealer is uniquely qualified to help guide you on the best system configuration for your needs.

Component Placement

The location of each of the loudspeakers plays a vital role in achieving proper frequency response and spacious imaging. Because the 408 and 508GTi systems have an extremely wide and

smooth dispersion pattern, excellent performance may be achieved in any vehicle. Due to the wide variety of vehicles, there is not one “right” way to locate the 408 and 508GTi, however knowledge of the following considerations will help you get the most from your system:

1.The most spacious stereo image is achieved when the speakers are placed as wide apart as possible.

2.The best center image will be achieved when the distance from the left speaker to your left ear is as equal as possible to the distance from the right speaker to your right ear. This is most easily achieved by placing the 408 or 508GTi as far forward as you can.

3.The best system integration is achieved when the woofer/midrange is mounted close to the tweeter. Installing the tweeter close to the woofer/midrange helps smooth the transition from woofer/midrange to tweeter at the crossover point.

4.You will get the best frequency response when the path from the speakers to your ear is unobstructed.

5.Because of the high acoustic energy capability of the 408 and 508GTi, the woofer/midrange drivers must be securely mounted in a rigid panel which is free from resonances, rattles and air leakage.

Installation Warnings and Tips

•Be careful not to cut or drill into fuel tanks, fuel lines, brake or hydraulic lines, vacuum lines or electrical wiring when working on your vehicle. Inspect behind panels before you cut or drill.

•Be sure to check for clearance of window, cranks and linkages when mounting speakers in door panels.

•Do not use the speakers unmounted. Failure to securely mount this product could result in damage or injury, particularly in the event of an accident.

•Although the materials used on the 408 and 508GTi are inherently water resistant, do not mount the speakers where they will get wet.

•Always disconnect the ground wire from the battery before doing any work on the vehicle.

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JBL 508GTI manual Component Placement, Installation Warnings and Tips
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508GTI specifications

The JBL 508GTI is a remarkable addition to the world of professional audio monitors, designed to satisfy discerning listeners as well as studio professionals. With its striking design and cutting-edge technology, the 508GTI offers an impressive listening experience tailored for various audio applications, from music production to film scoring.

At the heart of the 508GTI lies a 5-inch low-frequency woofer made of a proprietary polypropylene composite, ensuring excellent bass response and clarity. This cone design minimizes distortion, allowing for clean reproduction of bass frequencies down to 45 Hz. Complementing the woofer is a 1-inch titanium dome tweeter that delivers smooth and precise high frequencies up to 40 kHz. This wide frequency response ensures that the 508GTI reproduces audio accurately, making it easier for sound engineers to mix music that translates well across different playback systems.

One of the standout features of the JBL 508GTI is its innovative Image Control Waveguide technology. This sophisticated design optimizes the speaker's dispersion pattern, allowing for a larger sweet spot while maintaining excellent stereo imaging. As a result, listeners can enjoy an immersive sound experience even when they are not seated directly in front of the monitors.

The 508GTI also incorporates advanced bi-amplification, utilizing separate amplifiers for the woofer and tweeter. With a total power output of 82 watts, this design ensures that each driver operates at its peak performance without compromise. Additionally, the built-in DSP processing allows users to tailor the speaker’s performance to their specific acoustic environment, making it highly versatile for any studio setting.

Connectivity options on the JBL 508GTI include XLR and TRS balanced inputs, providing flexibility for various professional audio sources. The speaker is also equipped with rear controls for adjusting high and low-frequency response, enabling users to optimize their listening experience based on the room's acoustics.

In summary, the JBL 508GTI combines premium materials, innovative technologies, and versatile features, making it an exceptional choice for audio professionals seeking accuracy and reliability. Its blend of performance, design, and functionality ensures that it stands out in the competitive field of nearfield monitors, delivering a listening experience that is both enjoyable and precise.
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