User manual JBL L88 PLUS

[. . . ] If you feel you lack the tools or necessary experience, ask your authorized JBL car-audio dealer about professional installation options. Installation Warnings and Tips · Always wear protective eyewear when using tools. · Turn off all audio systems and other electrical devices before you start. Disconnect the negative (­) lead from your vehicle's battery. [. . . ] Disconnect the negative (­) lead from your vehicle's battery. · Keep speakers in their package until final installation. When moving a speaker, always rest it with the cone or dome facing up. · Check clearances on both sides of a planned mounting surface before drilling any holes or installing any screws. Remember that the screws can extend behind the surface. · At the installation sites, locate and make a note of all fuel lines, hydraulic brake lines, vacuum lines and electrical wiring. Use extreme caution when cutting or drilling in and around these areas. Caution: In some cars, fuel tanks may be located directly beneath the rear deck. Check for adequate speaker-basket clearance before considering use of this location!The tweeter may be either surface-mounted or flush-mounted with parts supplied in the P-Kit. Connecting the woofer and tweeter to the passive crossover, as shown in Figures 7a and 7b. Figure 6a. Figure 7a. Figure 7b. Position the "Lo Pass" and "Twt Frq" according to the speaker you are using as shown in the callouts in Figure 7b. Jumper Functions Lo Pass (Low Pass): You may engage or disengage the woofer low-pass filter with this jumper. Because the natural rolloff of the P-532 and the P-632 begin at a lower frequency than that of the P-432, this jumper should only be in the "on" position when the P-432 is being used. Twt Lvl (Tweeter Level): You may attenuate the level of the tweeter's output using this jumper. Twt Frq (Tweeter Frequency): Because the P-432 has usable frequency response higher than that of the P-532 or P-632, the optimum crossover frequency for the tweeter is slightly higher when the P-23t is used with the 4" woofer. Note: For the most accurate sound reproduction, the jumper positions should be set according to JBL recommendations. If an alternate setting better suits your preference or works better for your particular installation, you may position the jumpers as you like without affecting your warranty. Note: You may upgrade the performance of the P-432, P-532 or P-632 (when it is used as a multielement speaker) by utilizing the passive crossover contained in the P-Kit and leaving the tweeter mounted on the woofer. Figure 6b. Flush-mounting the P-23t (use a hole saw to cut a 1-9/16" hole in the mounting surface). Remove the top of the passive crossover by squeezing the sides and lifting off the top. [. . . ] Note: For the most accurate sound reproduction, the jumper positions should be set according to JBL recommendations. If an alternate setting better suits your preference or works better for your particular installation, you may position the jumpers as you like without affecting your warranty. Note: You may upgrade the performance of the P-432, P-532 or P-632 (when it is used as a multielement speaker) by utilizing the passive crossover contained in the P-Kit and leaving the tweeter mounted on the woofer. Figure 6b. Flush-mounting the P-23t (use a hole saw to cut a 1-9/16" hole in the mounting surface). Remove the top of the passive crossover by squeezing the sides and lifting off the top. [. . . ]