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When the cover is removed, the amplifier will turn off and speaker connections can be made safely. Use 0-gauge cable to connect the BATT+ terminal directly to the vehicle’s battery. If the battery is located in the engine compartment and the BATT+ cable must be routed through the firewall or any metal obstruction, install a wafer-type (ANN) fuse with a current rating of at least 500 amperes and an appropriate fuse holder within 18" of the vehicle’s battery (see Figure 5). 1 = Battery Voltage (to acc. volt meter) No Connection = 7 Ground (also use for acc. gauges) = 8 2 = Temperature (to acc. temp. gauge) Remote Level Control = 6 3 = Current (to acc. ampere meter) Remote Level Control = 5 4 = Remote Level Control Figure 6. Pinouts for the REMOTE LEVEL RJ45 connector on the A6000GTi or A3000GTi amplifier. IMPORTANT: Do not connect a jumper directly between the REMOTE and LIGHTING terminals. Doing so may burn out the remote turn-on circuits in your source unit. MAKING THE CONNECTIONS A6000GTi SPEAKER Figure 7. The JBL A6000GTi CONNECTIONS subwoofer amplifier is set The A6000GTi is a 2-channel amplifier to bridged mode to drive a designed to drive subwoofers only. subwoofer system. Only use The left and right input signals are this mode when the nominal combined inside the amplifier to equivalent or total impedance provide a mono output signal, no of the speaker system is matter which output mode is selected. 2 ohms or greater. 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. Bridged channels will provide high output voltage for driving loads with a nominal impedance of 2 to 4 ohms. Connecting the channels in Figure 8. The JBL A6000GTi parallel will provide the high current subwoofer amplifier is set necessary to drive loads of 1 to 2 ohms. to parallel mode to drive a subwoofer system. Only Included below are three application use this mode when the diagrams that will help you plan nominal equivalent or total your A6000GTi installation. Figures 7 impedance of the speaker through 9 show how to configure the system is less than 2 ohms. JBL A6000GTi subwoofer amplifier for bridged-mono, parallel-mono and NOTE: A jumper is added 2-channel operation (see Setting Up between the + terminals. the GTi Amplifier). IMPORTANT: If the nominal impedance of the speaker system is close to 2 ohms, you may try both bridged and parallel configurations to determine which one performs better. Remember to set the output mode switch to the Figure 9. The JBL A6000GTi appropriate setting when changing subwoofer amplifier is set configurations. to 2-channel mode to drive a pair of subwoofers or subwoofer systems with NOTE: For simplicity, Figures 7 through nominal equivalent or total 9 do not show power, remote and input impedances of 2 to 4 ohms. connections (see page 5). Set Output Mode to 2CH/BR (on input panel) See “Setting The Crossover” on Page 8 to Adjust Crossover Controls Set Output Mode to PARALLEL (on input panel) See “Setting The Crossover” on Page 8 to Adjust Crossover Controls Set Output Mode to 2CH/BR (on input panel) See “Setting The Crossover” on Page 8 to Adjust Crossover Controls A6000GTi Amplifier (partial output panel) Subwoofer System 2 ohms or more A6000GTi Amplifier (partial output panel) Subwoofer System jumper 2 ohms or less A6000GTi Amplifier (partial output panel) Subwoofer System Subwoofer System 2 to 4 2 to 4 ohms ohms 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). NOTE: For simplicity, Figures 10 through 12 do not show power, remote and input connections (see page 5). OUTPUT LOAD SWITCH The Output Load switch is used to optimize amplifier performance when driving a full-range signal. Set the switch according to the nominal impedance of the load: Use the 4-ohm mode when driving loads with a nominal impedance greater than 2 ohms and the 2-ohm mode when driving loads with a nominal impedance of 2 ohms or less. Figure 10. The JBL A3000GTi amplifier is set to bridged mode to drive a subwoofer system. Only use this mode when the nominal equivalent or total impedance of the speaker system is 2 ohms or greater. Figure 11. The JBL A3000GTi amplifier is set to parallel mode to drive a subwoofer system. Only use this mode when the nominal equivalent or total impedance of the speaker system is less than 2 ohms. NOTE: A jumper is added between the + terminals. Figure 12. The JBL A3000GTi amplifier is set to stereo mode to drive a pair of full- range speaker systems with nominal equivalent or total impedances of 2 to 4 ohms. 7 A3000GTi Amplifier (partial output panel) 2 to 4 ohms 2 to 4 ohms...

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