User manual JBL GTQ240

[. . . ] GRAND TOURING SERIES 4/3/2 Channel Automotive Power Amplifier GT Q 3 6 0 , GT Q 2 4 0 O w n e r ' s M a n u a l GENUINE JBL 1. 12 Owner's Warranty Information Model Number Serial Number Dealer Name City, State, Zip Sales Receipt Number Date of Purchase 2 1. Introduction 1. 1 Thanks for purchasing your new GT series automotive multi-channel amplifier. Your GT series amplifier will easily connect to virtually any car audio system, whether it is factory installed or purchased separately. [. . . ] · Using the REM-IN feature ­ When +12 volts is applied to the remote IN/OUT terminal the amplifier is turned on. A red LED on the top panel of the amplifier will illuminate to indicate the amplifier is on. If the head unit has a +12 volt automatic antenna or amplifier remote activation wire, connect it to the REM-IN/OUT connector on the GTQ amplifier. When the amplifier is turned on, there is a time delay of several seconds (longer in cold weather) before the amplifier will produce sound. This eliminates the chance of annoying noises produced by the radio or signal processors being amplified and passed to the speakers when the system is first activated. · Some head units have no automatic antenna or power amp activation wire. Others have automatic antenna wires that are "on" only when the radio is used but not when a tape is played. In such cases, connect the remote-in turn-on terminal to an unused accessory terminal in the fuse block, or any other +12 volt source that is turned on and off with the vehicle's ignition switch. The remote on/off system 5 Cassette/CD Tuner Speaker-Level Output Connection (Use only when line-level output is not available) A. Satellite/Subwoofer Subwoofer (Low-Pass) (­) High-Pass Satellite Crossover Frequency: 100Hz C: 300µF capacitor 100V, non-polarized Subwoofer Low-Pass Crossover Frequency: 100Hz (­) (+) Cassette/CD Tuner CD Player or Changer Left Tweeter/Midrange Satellites (High-Pass) (+) C (+) C Right (­) L Antenna Input Power Antenna Cassette/Receiver Power Supply Wires CD Input Amplifier Speaker Level Inputs L: 6. 2mH air core inductor GTQ360 Power Antenna Relay Black - Power Ground Remote Antenna Blue (Blue/White) Remote On/Off Cassette/CD Preamp Output Fuse Fuse Amplifier Power Connection Amplifier Speaker Output Connection L GR1 LINE LEVEL INPUT GR2 PREAMP OUTPUTS GR1 GR2 SPEAKER LEVEL INPUTS SPEAKER OUTPUTS (BRIDGED: R+TOL­) R GR2 L L GR1 R L GR2 + +­ ­+ + + R + FUSE 30A REM FUSE IN/OUT 30A POWER MUTE Yellow - Back Up Power Red - Main +12V Antenna Motor Power Supply R +­ ­+ R GR1 L ­ ­ ­ ­ + ­ Blue w/White Stripe - Remote On/Off Amplifier Speaker Output Connection (Not Included) Fuse *You may change the subwoofer satellite crossover frequency by using the Inductor and Capacitor values calculated with the following formulas: Speakers High-Pass (Satellite Crossover): 30, 000 Desired crossover Frequency in Hz = New Capacitor Value in µF 30A 30A BATT(+) GND Ignition Switch + + ­ Speakers 620 Low-Pass (Subwoofer Crossover): Desired crossover Frequency in Hz = New Inductor Value in mH B. Center Channel Center Channel Bridged Speaker Connection* Main +12V Amplifier Speaker Output Connection ­ + + )­( 8 Minimum Vehicle Battery Power Ground )+( 8 L-Pad (Optional but Recommended) GTQ360 Chassis Ground LINE LEVEL INPUT GR2 PREAMP OUTPUTS GR1 GR2 SPEAKER LEVEL INPUTS SPEAKER OUTPUTS (BRIDGED: R+TOL­) R GR2 L L GR1 R L GR2 + +­ ­+ + + GR1 L R + FUSE 30A REM FUSE IN/OUT 30A POWER MUTE R +­ ­+ R GR1 L ­ ­ ­ ­ 30A 30A draws negligible current so a relatively small (18 or 20 gauge) wire may be used. · Using the REM-OUT feature ­ The REMIN/OUT terminal of the GTQ amplifier may be used to turn on other amplifiers when the GTQ amplifier is being turned on by the Common Sense circuitry in the speaker-level input. Simply connect the head unit speaker-level outputs to the GTQ amplifier speaker-level inputs and connect the REM-IN/OUT terminal to the remote-in terminal of other amplifiers or signal processors. The GTQ amplifier will turn on the other amps or processors whenever the Common Sense circuitry turns on the GTQ amplifier. BATT(+) GND * Center Channel Speaker Minimum 8 Ohms, Main Speakers Minimum 4 Ohms When Used Simultaneously. Stereo, Non-Bridged Speaker Connection* )+( )­( )­( )+( 4 Minimum 4 Minimum Simultaneous Stereo-Mono Connection Diagrams 6 5. Internal Adjustments 5. 1 Speaker-Level Input Impedance Adjustments The speaker level inputs of the GTQ amplifiers 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 lowerpriced 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 shown on the diagram below. This input is also capable of directly accepting signals, when in the 100k ohm setting, from many Balanced Line Drivers such as those sometimes used in competition vehicles. If the head unit has 4 channels of built-in amplification and/or an electronic fader control, you should leave the jumpers in the factory-set position. If the head unit has 2 channels of amplification, with a speaker-level fader, the jumpers should be set to the 15-ohm position. [. . . ] · Incorrect gain adjustment; verify that the amplifier gain controls are not turned completely down. If they are, sound output level may be very low and may give the impression that the system (or part of the system) is dead. Power light is on, but no sound is heard from some or all of the speakers · Defective head unit or signal processor; check each component for proper wiring and operation. · Defective GTQ amplifier; if there is audio signal present at the inputs of the amplifier and there is no output, the GTQ amplifier may be defective. Alternator whine through the audio system with the engine running · Ground loops; follow the wiring suggestions in the section called "Solving Noise Problems. " Also, verify that the chassis grounding point you have chosen is true ground by checking for continuity between the chassis ground point and battery ground. [. . . ]