User manual JBL GTO4000

[. . . ] If you feel you lack the tools or necessary experience, ask 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. [. . . ] JBL accepts no liability for hearing loss, bodily injury or property damage resulting from use or misuse of this Wiring the Input-Signal Connections Connect a pair of signal cables with RCA-type ends between the connectors on the amplifier and the RCAtype signal connectors on the source unit. If your radio has only speaker-level outputs, you must purchase a speaker-level-to-line-level adapter, commonly sold as an accessory. system Setup and Adjustement Refer to figures 1-3 for location of adjustement switches and controls. Electronic Crossover The electronic crossover can be selected as a 12dB/oct high-pass filter (HPF), 12dB/oct low-pass filter (LPF) or it can be defeated (OFF). The crossover frequency can be set at any frequency between 30Hz and 320Hz. Input Sensitivity initially, turn the input-sensitivity LEVEL control to its maximum (counterclockwise) position. Turn on the source unit and increase the volume control until it is approximately t h r e e quarters of maximum-output level. Slowly increase the input LEVEL control (clockwise) while listening to the quality of the reproduced sound. When you hear distortion on the music peaks, turn the LEVEL control back slightly. It will only decrease the amount of volume control rotation before the amp is at full output power. It will also increase the amount of extraneous noise in your system. Choosing a Location and Mounting the Amplifier Amplifiers need air to stay cool. Suitable locations are under seats (provided the amplifier doesn't interfere with the seat-adjustement mechanism), in the trunk or in any location that provides enough air for the amp to cool i s l . Do not mount the amplifier with the heat-sink tef fins facing downward; this makes convection cooling of the amplifier impossible. Mount the amplifier so that it is not damaged by the feet of back-seat passengers or shifting cargo in the trunk. Mount the amplifier so that it remains dry never mount an amplifier outside the car or in the engine compartment. [. . . ] The total impedance of the speaker system connected to the amplifier when the amplifier is driven in stereo must be at least two ohms. If you are bridging the amplifier, connect the speaker wires to the terminals marked "bridged", observing proper polarity. HP (4 ohm) If you are running the amp in Tri-Mode (stereo and 75Hz 8. [. . . ]