User manual JBL S119

[. . . ] Also, be sure to save your sales receipt in a safe place. It will be necessary to use this document as proof of purchase in the event that you ever need warranty service. It is also useful for insurance purposes and for establishing value when you re-sell your vehicle. About This Manual Because of the performance capability of your GTi Competition Series product, and the variety of potential system configurations, we strongly recommend that you have the system professionally installed. You will also get a better warranty if your equipment is professionally installed by an authorized GTi dealer and you have your warranty card stamped. [. . . ] Because of the high acoustic energy capability of the 404 and 504GTi, they 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. When door mounting the speakers, make sure there is sufficient clearance for windows, electric window motors or cranks, and linkages. 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. 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 404 and 504GTi 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. Mounting Instructions Pick a mounting location after reading the recommendations in the Coupled ComponentTM Placement section of this manual. Installing the GTi System Crossover The GTi system crossover should be mounted securely to prevent damage to the crossover or possible loosening of wiring connections. Choose one of the crossover mounting methods and follow the directions on the following page. · · · · 6 Mounting the GTi Crossover with Wire Ties 1. Remove the crossover cover as shown in Figure G. Remove the crossover board from the plastic case. Use wire ties to secure the plastic case to the desired location as shown in Figure A. Before cutting or drilling make sure that there are no car components, electrical wiring or any other items that could be damaged. Cut out the speaker hole at the mounting location and drill the three marked pilot holes with a 1/8" (3mm) drill. Run speaker wire to the hole location, making sure that either an active or the included passive crossover is connected before the speaker. This does not mean that the Coupled ComponentsTM should always be connected in the same polarity as the woofer/midbass or subwoofer however. It is possible, due to the difference in the distance that the sound travels from the Coupled ComponentsTM to your ears, compared to the distance from the subwoofer or woofer/midbass, and the wavelengths of sound at the crossover frequency, that a connection where the subwoofer or woofer/midbass are connected in reverse polarity from the Coupled ComponentTM 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 Coupled ComponentsTM and the subwoofer or woofer/midbass. Some active crossovers, such as the JBL GTX47, have a phase switch which enables you to easily switch polarity. When the subwoofer or woofer/midbass and Coupled ComponentsTM are mounted close to each other, the in-phase connection will usually yield the best sound. System Connections There are a variety of system options available with the 404 and 504GTi. The simplest configuration is to use the 404 and 504GTi full range. Although this will yield good sound, the best performance will be achieved in a high-end system which includes subwoofers and, optionally, midbass transducers. Because the 404 and 504GTi are specifically designed for mid and high frequency operation, they should have their extremely low frequencies blocked by electrical means in order to achieve the best system fidelity and the widest dynamic range. [. . . ] After a break-in period of about 1-hour at moderate volume the drivers will achieve peak performance. A Note on Power Handling As a result of their high efficiency, all JBL loudspeakers will produce reasonable volume levels in the automotive environment using very little amplifier power. However, the use of a low-powered amplifier to attain very high volume levels could lead to overdriving the amplifier. This will generate high distortion levels which can easily damage loudspeakers, even if the rated power of the amplifier is below the rated maximum power handling of the loudspeaker!As a general rule, do not turn up the volume control past the point where you hear distortion in the form of either signal distortion from an overdriven amplifier or mechanical noise from an overstressed speaker. [. . . ]