User manual JBL XPL160

[. . . ] The dome of the 08GTi is created using special nitrogen gas cooled forming machines which can create a uniformly paper-thin dome without the work-hardening or deformation which causes resonances in domes made without benefit of this process. The result is exceptionally smooth and detailed high fre5 quency music reproduction to beyond 20, 000Hz, high output capability, and a clean sound that cuts through road noise. Designing Your System The availability of separate components makes a variety of system designs possible. Because of its wide-range design and variety of mounting options, the 08GTi is perfect for many different applications. The overall quality of any system design is a result of how well all of the components work together, not just the result of the performance of 6 any one component. [. . . ] Due to the wide variety of vehicles, there is not one "right" way to locate the 08GTi, however knowledge of the following considerations will help you get the most from your system: 7 1. 2. 3. The most spacious stereo image is achieved when the 08GTi's are placed as wide apart as possible. 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 08GTi as far forward as you can. Because of this, you can improve imaging by using the angle-mount capabilities of the 08GTi to point each tweeter's axis across the car to the listener on the opposite side. This will make each listener slightly off-axis of the tweeter they are closest to, which helps to compensate for the fact that they are always closer to one tweeter than to the other. 8 4. 5. The best system integration is achieved when the tweeter is mounted close to the midrange speaker. Installing the tweeter close to the midrange helps smooth the transition from the midrange to the tweeter at the crossover point. You will get the best frequency response when the path from the tweeter to your ear is unobstructed. or hydraulic lines, vacuum lines or electrical wiring when working on your vehicle. Failure to securely mount this product could result in damage or injury, particularly in the event of an accident. Always disconnect the ground wire from the battery before doing any work on the vehicle. Installation Warnings and Tips Be careful not to cut or drill into fuel tanks, fuel lines, brake 9 Mounting Instructions: The 08GTi tweeter includes accessories for four different mounting configurations. Take a look at all the possibilities described in the following paragraphs, pick one, follow the steps and you'll soon be done! work best. Drill the holes as shown on the template in the desired mounting location. It is possible, that due to the difference in the distance the sound travels from the 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 other drivers in the system may actually result in better sound. Because there is no way to accurately predict this before 18 installation, we recommend that you try the connection both ways, and leave it in the polarity that gives the smoothest audible transition between the midrange and tweeter. The JBL standard for polarity marking uses the solid red wire as positive (+) and the black striped wire as negative (­). System Connections: There are a variety of system options available with the 08GTi. The simplest configuration is to use the 08GTi connected in parallel to a full range speaker system. Because the 08GTi is specifically designed for high frequency operation, it must have low frequencies blocked by electrical means to prevent damage to the speaker. To facilitate this, the 08GTi is supplied with an in-line 12dB per octave 5kHz high-pass filter. This allows you to use the 08GTi as an add-on to an existing system by attaching the supplied protection network in parallel to the existing speakers, and connecting the tweeters to the output of the network as in fig. A disadvantage of this type of system is that the high frequencies are not blocked from the midrange drivers, making the performance of this type of system typically less accurate than one where a full crossover is used. A better approach is a complete low-pass or band pass filter for the midrange driver, combined with a high pass filter for the tweeter. When a matched GTi Competition Series system is 19 used, the best crossover choice is the laboratory-optimized, system-matched crossover which is included with the 408GTi or 508GTi system. If you have not yet installed your components, we suggest that you consult your dealer for this system package. [. . . ] An exception to this is if the protection network or passive crossover is mounted near a source of radiated noise, the network may pick-up this noise with sufficient power to drive the 08GTi tweeters. For this reason, 23 be careful not to mount any passive crossover components near wires carrying high currents such as battery cables or wires leading to ammeters or tachometers. Distortion is usually the result of overdriving one or more components in the system. The problem is most likely insufficient amplifier power, or improper setting of gain controls. [. . . ]