User manual JBL GTX10

[. . . ] Installation and use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . System Design with the GTX10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3. 1 Speaker Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3. 2 Typical Applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] LED blinks when protection circuitry or muting is engaged. 10 GTX10 Block Diagram GR 1 MODE SWITCH GTX10-20107 CH. 2 L OUT Preamp-level inputs LP X-OVER 3 2 L Buffer Buffer BASS BOOST HP + CH. 2 R OUT 2 AMP 1 2 3 GR 1 Left Speaker Out GR 1 1 AMP GR 1 L PREOUT 3 Buffer LP X-OVER 1 2 3 3 + HP GR 1 R PREOUT 1 2 3 1 1 2 3 2 GR 1 Right Speaker Out R Buffer 2 06/03/98 15:49 L Buffer 1 2 1 2 3 + LP X-OVER 3 3 3 2 1 2 1 1 GR 2 + HP Buffer 2 AMP GR 2 Left Speaker Out R LP X-OVER 3 2 3 1 2 1 GROUP 2 INPUT 1 ­ GR 1 2 ­ GR 2 Buffer 2 3 BASS BOOST Buffer 1 GR 2 L PREOUT Side 11 AMP GR 2 Right Speaker Out L Buffer GR 2 MODE SWITCH HP GR 2 R PREOUT 1 2 3 GR 3 1 2 3 1 AMP GR 3 Left Speaker Out 2 R LP X-OVER Speaker-level inputs + + HP 1 2 3 1 2 3 1 Buffer 1 2 3 Buffer GR 3 L PREOUT 3 1 + L Buffer LP X-OVER HP Speaker Preamp GROUP 3 INPUT 1 ­ GR 3 2 ­ GR 2 3 ­ GR 1+2 + + 1 2 3 1 2 3 Buffer GR 3 R PREOUT 2 3 BASS BOOST AMP GR 3 Right Speaker Out GR 3 Input Mode GR 1 + R 1 ­ Flat 2 ­ Low Pass 3 ­ High Pass Buffer Crossover Crossover 1 ­ Flat 2 ­ Low Pass 3 ­ High Pass Mode 1­L 2 ­ Stereo 3 ­ L+R L Buffer - + GR 2 + R - Buffer 11 GTX10-20107 06/03/98 15:49 Side 12 4. 2 Internal Adjustments Speaker-Level Input Impedance Adjustments The speaker level inputs of the GTX10 come factory set with 100k ohm input impedance. This will provide the lowest distortion operation from the speaker outputs of most modern head units by reducing the power the amplifier in the head unit must deliver to practically nothing. On some older, or lower-priced head units, this load will not facilitate proper fader operation. To allow for this, we have provided the ability to change the input impedance of the speaker-level inputs to 15 ohms. This is accomplished by moving the jumpers JUMPER SELECTOR SELECT 100K OR 15 OHMS rotary-type control, not one controlled by electronic pushbuttons. If you are not certain of the type of fader control your unit has, measure the resistance across one set of speaker outputs with an ohmmeter (with the head-unit off). Adjust the fader control through its entire adjustment range. If there is a change in the resistance as the control is adjusted, set the jumpers to the 15-ohm position. (See step 1, page 16 to remove bottom cover. ) Crossover Frequency Adjustments The GTX10 amplifiers include built-in frequency selectable crossovers. PC L GTIDGE 00 S6 , C RE 1088 00 A V A 00 13 GTX10-20107 06/03/98 15:49 Side 14 Under-Dash Remote Installation 1. Set the GTX10 remote in the installation location and mark two mounting screw hole locations. Set the GTX10 remote aside and drill two pilot holes using a 1/16"(1mm) bit. Be careful not to drill into any of the car's components. Secure the spacer and faceplate (with the control labeling) to the front of the remote control panel using the four smaller screws included. Push the two adjustment knobs onto the metal shafts. Set the GTX10 remote back in place and secure it using two sheet metal screws. Continue to Step 6 in the "In-Dash Installation" section. Choose a location for the in-dash installation and use the template at the back of this manual to mark hole locations as shown on the template. Drill the holes indicated on the template. Using the diagram on page 15 as reference, install the remote behind the panel with the holes just drilled. [. . . ] This circuitry will turn the amplifier off in the event of overheating, a short circuit on the speaker output wiring, or improper power supply connections. If the amplifier cycles on 19 GTX10-20107 06/03/98 15:50 Side 20 and off, or does not work at all, a problem in installation or an abnormal electrical condition is indicated. Check speaker wiring for short circuits or impedance loads significantly below 2 ohms (4 ohms in bridged mode). Check the power supply voltage at the input of the amplifier to be sure that it is normal; between 11 and 16 volts. [. . . ]