User manual JBL PRO III

[. . . ] Use extreme caution when cutting or drilling in and around these areas. · Before drilling or cutting holes, use a utility knife to remove unwanted fabric or vinyl to keep material from snagging in a drill bit. · When routing cables, keep input-signal cables away from power cables and speaker wires. · When making connections, make certain they are secure and properly insulated. [. . . ] CHOOSING A LOCATION AND MOUNTING THE AMPLIFIER Choose a mounting location in the trunk or cargo area where the amplifier will not be damaged by shifting cargo. Amplifier cooling is essential for proper amplifier operation. If the amplifier is to be installed in an enclosed space, make sure there is sufficient air circulation for the amplifier to cool itself. When mounting the amplifier under a seat, ensure that it is clear of all moving seat parts and does not affect the seat adjustments. Mount the amplifier so it is not damaged by the feet of backseat passengers. Make sure that the amplifier is mounted securely using nuts and bolts or the supplied mounting screws. Mount the amplifier so that it remains dry ­ never mount an amplifier outside the vehicle or in the engine compartment. POWER CONNECTIONS The CS amplifiers require a reliable connection to the vehicle's electrical system in order to perform optimally. See Figure 1 for terminal connection locations. Please adhere to the following instructions carefully: Ground Connection Connect the amplifier's Ground (GND) terminal to a solid point on the vehicle's metal chassis, as close to the amplifier as possible. Refer to the chart below to determine minimum wire-gauge size. CS subwoofer amplifier with one woofer connected. APPLICATIONS ­ CS50. 4 The CS50. 4 can be set up for stereo 4-channel, 3-channel or bridged 2-channel operation, as shown in Figures 4 through 6. NOTE: For simplicity, Figures 4 through 6 do not show power, remote and input connections. NOTE: Minimum speaker impedance for stereo operation is 2 ohms. Minimum speaker impedance for bridged operation is 4 ohms. Figure 4. CS50. 4 amplifier in 4-channel (stereo) operation to drive front and rear full-range speakers. Figure 5. CS50. 4 is set up for 3-channel operation to drive a set of full-range speakers and a subwoofer. Figure 6. CS50. 4 used in bridged 2-channel mode to drive a set of components or subwoofers. Set crossovers according to application. 3 CONTROLS AND SETUP SETTING THE CROSSOVER(S) Determine your system plans and set the crossover mode switch accordingly. If your system design does not include a subwoofer with the CS50. 4, set the crossover mode to FLAT and skip to "Setting Input Sensitivity. " Initially set the crossover frequency control midway. While listening to music, adjust the crossover for the least perceived distortion from the speakers, allowing them to reproduce as much bass as possible. Systems using a separate subwoofer set the crossover mode to HP (high pass) for your full-range speakers. [. . . ] Adjust the crossover frequency to limit bass and provide increased system volume with less distortion. For subwoofers, choose the highest frequency that removes vocal information from the sound of the subwoofer. If using the CS50. 4 to drive a subwoofer(s), set the crossover mode to LP (low pass). Initially turn the INPUT LEVEL control(s) to minimum (counter clockwise). [. . . ]