JBL GTS600 Manuals

either subwoofer or component speakers in a bi-amplified system, or conventional full-range speakers in simpler systems. The GTS300 and 600 also include preamp-level outputs which can provide either full-range, high-pass or low-pass signal to drive additional amplifiers. This lets you build systems of virtually any design without requiring a separate electronic crossover. 1.2 About Installation Although the GTS300 and GTS600 are designed to make installation as easy as possible, they are sophisticated products that require proper installation to realize their full performance potential. If you feel you do not have the necessary knowledge and skills we strongly recommend that the installation be done by your authorized JBL dealer. If you choose to install the GTS300 or GTS600 yourself read all of the information in this manual before you start the installation. Pay particular attention to the safety precautions and notes. 2. Installation and Use Refer to the “Crossover Frequency Adjustments” and “Speaker Level Input Impedance Adjustments” sections of this manual to see if you will need to make alterations to their factory settings. If you are not using the built-in crossover, or the speaker level inputs, you may skip this step. 1. Disconnect the negative cable from the battery. Note: If the vehicle’s radio features a code type security system, make certain you know the code 1 1. Introduction Thanks for purchasing your new GT series automotive amplifier. The GT series amplifier you have chosen includes many unique features to enhance its perfor- mance and utility. The power amp- lifier circuitry is a fully discrete design notable for its low dis- tortion and unusually clean and clear sound quality. Your GT series amplifier will easily connect to virtually any car audio system, whether it is factory installed or one purchased separately. In addition to conventional preamplevel inputs, this model features JBL’s Universal Interface design, which facilitates simple connection to factory radios with the low distortion that is usually only associated with preamp level connection. With Universal Inter- face, a factory radio can be used either as the main music source or combined with a CD player or changer, which includes volume control capability, simultaneously connected to the amplifier. By providing this two-unit direct connection, Universal Interface circuitry eliminates the need for an FM modulator to interface a CD player to factory radios, improving the fidelity of digital playback. In addition, when using a high- powered (BTL) radio through the speaker-level inputs, Common Sense turn-on circuitry senses the common-mode voltage present on the radio’s speaker wires, turning the amplifier on without an additional “remote” wire. Also, the built-in active crossover provides either full-range, high- pass or low-pass operation. This lets your GT series amplifier power 2 before disconnecting the battery! 2. Run a minimum AWG #8 power cable complete with a 40 amp fuse (not included) for the GTS300 or an AWG #6 or AWG #4 cable with an 80 amp fuse for the GTS600 directly from the positive + 12V battery terminal to the disired amplifier location. Keep the fuse to within 6” of the battery terminal, and before the wire runs through any metal partition. Note: All wiring connections should be made either by soldering with heatshrink tubing insulation or with high quality crimp type insulated connectors installed with a professional type, articulated crimping tool. Soldering crimptype terminals is recommended for additional security. Never use wire-nuts, insulation-displacement connectors (i.e. ScotchLok type), or “twist and tape” connections. Do not use electrical tape; it will loosen with age and extreme temperatures. 3. Mount amplifier in the desired location using four screws. 4. Connect power wiring as shown i the Wiring Diagram. 5. Connect the outputs from the head unit to the appropriate inputs of the amplifier according to the Wiring Diagram with either high quality low-level signal cables with RCA plugs, with the supplied speaker-level input connector, or both. 6. Connect the speakers to the amplifier according to the wiring diagram. 7. Turn the input gain adjustment to the 1/4 position. 8. Set the crossover switches as desired. 9. Set the input mode switch to stereo, left + right or right input only operation. 10. Set the bass boost switch to the desired position. 11. Reconnect the negative battery cable. 12. Turn on the signal source at a low volume level and check for the correct output from each speaker. 13. Adjust the amplifier gain control using the procedure described in the “Adjusting the Gain” section. 2.2 Controls and Connectors 1. Preamp-Level Input Connector – Use these connectores for line (preamp) level input to the amplifier. 2. Preamp-Level Output Connector – Use these outputs to send the signal to additional amplifiers. 3. Speaker-Level Input Connector – Use this connector for speaker level input signals. A wire harness is supplied for use with this connector. This input also includes JBL’s Common Sense input circuitry which turns the amplifier on as soon as the high powered head unit connected to this input is turned on. 4. Speaker Output Connector – Connect speaker wiring to this connector. See “Wiring” directions for more information. 5., 6., 7., 8., Power Connector – Connection for power wires #A. See “Wiring” directions for information on proper connections. 9. Fuse – 40 Amp ATC type fuse for the GTS300 and two 40 amp fuses for the GTS600. 10. Gain Control – Use this control to adjust the input sensitivity of the amplifier. See the “Adjusting the Gain” section for tips on proper setup. 11. Preamp-Output Crossover Switch – This switch controls the built-in crossover that is directed to the preamp-output connectors. Set the switch to “Flat” for full band operation. Set this switch to “Low-Pass” to activate the low- pass filter on the preamp output (for subwoofer use). Set the switch to “High-Pass” to activate the high-pass filter for use with satellite speakers. 12. Speaker Output Crossover Switch – This switch controls the built-in crossover that is connected to the power amplifier circuitry. Set the switch to “Flat” for full band operation. Set this switch to “Low Pass” to activate the low pass filter on the amplifier (for subwoofer use). Set the switch to “High Pass” to activate the high pass filter for use with satellite speakers. 13. Input Mode Selector – This switch is used to set the input mode for both preamp and speaker-level inputs. Set this switch to Stereo for normal operation using both left and right inputs. Set this switch to R to drive both the left and right output channels with only a single input on the right channel. Set this switch to “L+R” to sum the left and right inputs for a mono output on both amplifier channels. Power Indicator LED (on chassis top) – LED steadily illuminates for normal operation. LED blinks when protection circuitry or muting is engaged. 14. Bass Boost Switch – This activates a built-in Bass Boost circuit used to increase low-bass output. 3 Œ Preamp Level RCA Inputs  Preamp Level RCA Outputs Ž High Level Speaker Inputs  Speaker Outputs  Remote Turn On Output ‘ Battery Ground ’ Battery (+12v) In “ Remote Turn On Input ” Fuse 40A LINE INPUT PREAMP OUTPUT L L R R SPEAKER LEVEL INPUT SPEAKER OUTPUT POWER FUSE 40A BRIDGED + _ + _ + _ + _ BATT(+) REM OUT REM IN GND Power Connector R L R L BASS BOOST INPUT MODE STEREO ON OFF L+R R SPEAKER OUTPUT CROSSOVER LOW PASS HIGH PASS FLAT PREAMP OUTPUT CROSSOVER HIGH PASS FLAT LOW PASS NOM GAIN MIN MAX • Gain Control Preamp Crossover Frequency Selector Amplifier Crossover Frequency Selector Input Mode Selector Bass Boost