car audio power amplifier owner’s manual THANK YOU for purchasing a JBL A6000GTi or A3000GTi amplifier. For warranty support, please register your purchase at www.jbl.com. Select Car Audio, then click on Support, and then click on Product Registration. Also, please retain your original purchase receipt and packing crate in case you must ship your unit back for service.
INSTALLATION WARNING: Playing loud music in an automobile can hinder your ability to hear traffic and permanently damage your hearing. We recommend listening at low or moderate levels while driving your car. JBL accepts no liability for hearing loss, bodily injury or property damage resulting from the use or misuse of this product. IMPORTANT: To get the best performance from your JBL A6000GTi or A3000GTi amplifier, we strongly recommend that installation be entrusted to a qualified professional.
DESIGNING A SPEAKER SYSTEM FOR THE GTi AMPLIFIER NOTE: Although the JBL A6000GTi or A3000GTi amplifier will drive a system made up of any subwoofers, we recommend using JBL GTi subwoofers with GTi amplifiers. Both the JBL A6000GTi and A3000GTi amplifiers provide RMS power that exceeds the RMS power-handling rating of nearly every subwoofer available.
SUPPLYING POWER TO THE GTi AMPLIFIER POWER IN IS POWER OUT In order to get full power out of your amplifier, you must provide full power to your amplifier. That’s a basic rule of physics. The A6000GTi amplifier can draw nearly 800 amperes when reproducing sine waves at full output. Both JBL A6000GTi and A3000GTi amplifiers can quickly exhaust the factory-installed charging system of any vehicle on the road today.
MAKING THE CONNECTIONS POWER CONNECTIONS Use 0-gauge cable to connect the amplifier’s GND – terminal directly to the vehicle’s chassis (see Figure 5). Scrape off all paint from the metal area for a good, clean ground connection. Make sure the ground wire is as short as possible and is connected to metal on the vehicle’s body. Do not connect the GND – cable to the frame of the vehicle. It is isolated from the chassis using rubber shims and will not provide an adequate ground.
MAKING THE CONNECTIONS A6000GTi SPEAKER CONNECTIONS The A6000GTi is a 2-channel amplifier designed to drive subwoofers only. The left and right input signals are combined inside the amplifier to provide a mono output signal, no matter which output mode is selected. The A6000GTi can be connected to two independent speaker systems in 2-channel mode. It can be connected to a combination of subwoofers configured as a single load with its channels bridged or connected in parallel.
MAKING THE CONNECTIONS A3000GTi SPEAKER CONNECTIONS Included below are three application diagrams that will help you plan your A3000GTi installation. Figures 10 through 12 show how to configure the JBL A3000GTi amplifier for bridged-mono, parallel-mono and 2-channel operation (also see Setting Up the GTi Amplifier). Figure 10. The JBL A3000GTi amplifier is set to bridged mode to drive a subwoofer system.
SETTING UP THE GTi AMPLIFIER SETTING THE CROSSOVER IMPORTANT: If you plan to use the A3000GTi to drive full-range speakers, set the crossover mode switch to FLAT and skip to the next section, “Setting Input Sensitivity.” 1. Depending on your system plan, set the A3000GTi’s crossover mode switch to LP (low-pass) or HP (highpass). The A6000GTi is a low-pass amplifier only, designed to drive subwoofers. No crossover switch is provided. 2.
SETTING UP THE GTi AMPLIFIER REPLACING THE FUSE OR NEON TUBES The JBL A6000/A3000GTi amplifier is equipped with an internal fuse, a 20-inch neon tube and two 6-inch neon tubes. Should the fuse or a neon tube fail, perform the following steps to replace the part: Figure 14. Removing bottom screws and the clear cover from the A6000GTi amplifier. NOTE: Do not remove the logo badge assembly.
SETTING UP THE GTi AMPLIFIER 7. Using a T-15 screwdriver, remove the two Torx-head screws on the display board and set them aside (see Figure 16 below). Disconnect the ribbon cable from display board. 8. Using a T-15 screwdriver, remove the 16 Torx-head screws on the perforated shield and set them aside (see Figure 16). Figure 16. Removing the fuse from the A6000GTi amplifier. 9. Using a small flat-blade screwdriver, disconnect the wiring for the neon tubes. 10.
TROUBLESHOOTING SYMPTOM No audio (Power LED is off) No audio (Power LED is flashing) LIKELY CAUSE No voltage at power or remote terminal Internal fuse blown (incorrect power connections) Low or high voltage at power terminal No audio (Power and Fault LEDs are on) No audio (Power and Thermal LEDs are on) Distorted audio (I OPT and/or E OPT LED[s] are on more than off) Distorted audio (I OPT and/or E OPT LED[s] work correctly) Direct current on speaker output(s) Music lacks “punch” Speakers are out of
JBL Consumer Products 250 Crossways Park Drive, Woodbury, NY 11797 USA © 2004 Harman International Industries, Incorporated JBL and Crown are registered trademarks of Harman International Industries, Incorporated. Part No. GTIAMPOM4/04 Features, specifications and appearance are subject to change without notice. www.jbl.