Wiring, Crossover Tweeter Level Adjustment

Wiring

Use 2-conductor stranded type, insulated wire to connect the 408 and 508GTi Woofer/Midrange and tweeter to the included crossover, and the crossover to the amplifier as shown in Figure K.

A minimum wire gauge of 18AWG is recommended, with larger size suggested for wire runs longer than 10 feet.

BLACK	TWEETER WOOFER INPUT
(–)
RED
(+)
	508 GTI Crossover

Connect to

White “W”

Terminal

Connect to

Red “W”

Terminal

Figure K

The polarity (the positive / negative orientation of the connections) for every speaker and crossover to amplifier connection must be consistent from left to right channel to assure proper imaging and optimum frequency response. This does not mean that the woofer/midrange should always be connected in the same polarity as the tweeter however. It is possible, that due to the difference in the distance the sound travels from the woofer/midrange to your ears compared to the distance from the tweeters in a typical system, and the short wavelengths of sound at the crossover frequency, that a connection where the tweeters are connected in reverse polarity from the woofer/midrange drivers may actually result in better sound. Because there is no way to accurately predict this before installation, we recommend that you try the connection both ways, and leave it in the polarity that gives the smoothest audible transition between the woofer/midrange and tweeter. When the tweeter and woofer/ midrange drivers are mounted close to each other, the in-phase connection will usually yield the best sound.

Crossover Tweeter Level

Adjustment

The Gti System Crossover allows you to adjust the level of the GTi Systems Tweeter. This adjustment is located under the crossover cover. To remove this cover simply press on the end of the cover

(as shown in Figure L) and lift off. The adjustment of the tweeter level is done by setting the switch on the crossover (see Figure M) to the “0dB,” “–2dB” or “–4dB” position. Set this switch in the position that matches your personal preference. Both crossovers should have this switch set in the same position.

LIFT

PRESS

Figure L

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.

JBL 508GTI manual Wiring, Crossover Tweeter Level Adjustment

Models: 508GTI