JBL LC-A752 Car Audio Amplifier
Contents
1. LUNE INPUT LC A304 ce 00 POWER fist BATTI REM _GND 20AMP Fog I Figure 3 Model No LC A504 mi m Orro OMR LC A504 ner CE POWER per BATIH REM GNDE op AMP Fu cl N Figure 4 Troubleshooting Symptom Likely Cause Solution No audio power indicator is on Speakers or input signal cables disconnected defective speaker or source unit Check connections source speakers No audio power indicator is off No voltage at BATT or REM terminals bad ground connection Check voltage at amplifier terminals with VOM Repair faulty connection No audio power indicator is off voltage at terminal OK Amplifier protection is engaged due to overheating shorted or defective speaker or speaker cable Disconnect speaker leads one at a time to determine which speaker or wire is shorted or defective Repair the short circuit2. or replace bad speaker Distorted audio Input sensitivity not set properly amplifier Check LEVEL setting check source or source unit defective unit Music lacks punch Speakers are not connected properly Check speaker connections for proper polarity LC A502 LC A752 LC A304 LC A504 Specifications Power Output 4 Ohms 50W x 2 75W x 2 30W x 4 50W x 4 Power Output 2 Ohms 65 W x 2 90W x 2 37 5W x 4 62 5W x 4 Power Output 4 Ohms Bridged 130W x 1 180W x 1 75W x 2 125W x 2 Frequency Response 20Hz 40kHz 20Hz 40kHz 20Hz 40kHz 20Hz 40kHz Input Sensitivity 250mV 4V 250mV 4V 250mV 4V 250mV 4V THD Noise 10 10 10 10 Signal to Noise Ratio gt 90dB gt 90dB gt 90dB gt 90dB Maximum Current Draw 20A 26A 23A 42A 2 5 16 x 8 5 16 x 7 9 16 58mm x 217mm x 191mm Dimensions HxWxD JBL JBL Consumer Products 250 Crossways Park Drive Woodbury NY 11797 8500 Balboa Boulevard Northridge CA 91329 1 800 336 4J BL 4525 USA only www jbl com 1999 J BL Incorporated JBL is a registered trademark of J BL Incorporated Part No LC AMPOM 3 99 H A Harman International Company 2 5 16 x 8 5 16 x 12 1 2 58mm x 217mm x 317mm 2 5 16 x 8 5 16 x 11 5 8 58mm x 217mm x 297mm 2 5 16 x 8 5 16 x 14 1 16 58mm x 217mm x 357mm
3. pass filter LPF or it can be defeated FLAT The crossover frequency can be set at any frequency between 32Hz and 320Hz Setting Input Level Initially turn the input sensitivity LEVEL control to its maximum counterclockwise position Turn on the source unit and increase the volume control until it is approximately three quarters of maximum output level Slowly increase the input LEVEL control clockwise while listening to the quality of the reproduced sound When you hear distor tion on the music peaks turn the LEVEL control back slightly This is the maximum undistorted output level of your system Turning the LEVEL control up farther WILL NOT INCREASE THE OUTPUT POWER OF YOUR AMP It will only decrease the amount of volume control rotation before the amp is at full output power It will also increase the amount of extraneous noise present in your system Model No LC A502 FRONT PANEL UU SO NU IR ie POWER LC A502 9 ce SUL ii Resa ii Figure 1 Model No LC A752 i FRONT PANEL Ur QAM LINE INPUT n CROSS ARTER LC A752 i i 2 I REAR PANEL A J Na I Soa I TO 0 ali Figure 2 Model No LC A304
4. 8 ON ana gt i i SM JBL Thank you for purchasing a JBL Loud Clear amplifier In order that we may better serve you should you require warranty ser vice on your new amplifier please retain your original purchase receipt and return the enclosed warranty registration card Installation Warnings and Tips e Always wear protective eyewear when using tools e Turn off all audio systems and other electrical devices before you start e Disconnect the negative lead from your vehicle s battery e Check clearances on both sides of a planned mounting surface before drilling any holes or installing any screws Remember that the screws can extend behind the surface e At the installation sites locate and make a note of all fuel lines hydraulic brake lines vacuum lines and electrical wiring Use extreme caution when cutting or Important Installation of auto motive stereo components can require extensive experience in performing a variety of mechani cal and electrical procedures Although these instructions explain in a general sense how to install Loud Clear amplifiers they may not show the exact installation methods for your particular vehicle If you feel you lack the tools or necessary experience ask your authorized JBL car audio dealer about profes sional installation options e Before drilling or cutting holes use a utility knife to remove unwanted fabric or vinyl to keep material from sna
5. gging in a drill bit e When routing cables keep input signal cables away from power cables and spedker wires e When making connections ensure that they are secure and properly insulated e If the amplifier s fuse must be replaced use only the same type and rating as that of the original Do not substitute another kind drilling in and around these areas Warning Playing loud music in an automobile can permanently damage your hearing as well as hinder your ability to hear traffic We recommend listening at low levels while in your car JBL accepts no liability for hearing loss bodily injury or property damage resulting from use or misuse of this product Choosing a Location and Mounting the Amplifier Amplifiers need air to stay cool Suitable locations are under seats provided the amplifier doesn t interfere with the seat adiustment mechanism in the trunk or in any location that provides enough air for the amp to cool itself Do not mount the amplifier with the heat sink fins facing downward this makes convection cooling of the amplifier impossible Mount the amplifier so that it is not damaged by the feet of back seat passengers or shifting cargo in the trunk Mount the amplifier so that it remains dry never mount an amplifier outside the car or in the engine compartment Using the amplifier as a template mark the location of the mounting holes on the mounting surface drill pilot holes and attac
6. h the amplifier to the mounting surface with screws Make sure the amplifier is mounted securely Wiring the Power Connections Refer to Figures 1 4 for connector locations Use at least 10 gauge wire for power and ground connections For power remote and ground connections strip off one end of each jacket to reveal bare wire for insertion into the barrier strip connectors Connect a wire from the GND connector on the amplifier to the nearest bare metal chassis component scrape away the paint to ensure good conductivity Next connect a wire between the BATT terminal on the amplifier and the POS terminal of the vehicle s battery Pass the wire through a factory installed grommet in the firewall or install a grommet if a factory grommet is not available You must install within 18 of the battery connection a fuse holder and fuse with the same rating as the fuse in the amplifier s chassis This will prevent a short circuit from causing damage to the amplifier or the car Connect a wire between the REM terminal of the amplifier and the remote out or power antenna lead on the vehicle s radio Wiring the Speaker Output Connections Connect the speakers observing proper polarity to the speaker output barrier strip The total impedance of the speaker system connected to the amplifier when the amplifier is driven in stereo must be at least two ohms If you are bridging the amplifier connect the speaker wires to the termi na
7. ls marked bridged observing proper polarity The total impedance of the speaker system connected to the amplifier must be at least four ohms in bridged mode If you are running the amp in Tri Mode stereo and mono simultaneously connect the satellite speakers to the speaker connector as you would a pair of stereo speakers Connect the subwoofer to the terminals marked bridged Refer to the chart below to determine the capacitor and inductor values you ll need to route bass signals to the woofer and the midrange and high frequencies to the satellite speakers These passive crossover components will also ensure that the impedance of the speaker system doesn t drop below two ohms FREQUENCY INDUCTOR CAPACITOR Crossover 6dB oct LP 6dB oct HP 4 ohm 4 ohm 75Hz 8 0mH 530uF 100Hz 6 4mH 400pF 125Hz 5 0mH 318uF 150Hz 4 2mH 265uF 175Hz 3 6mH 227UF 200Hz 3 2mH 198uF Wiring the Input Signal Connections Connect a pair of signal cables with RCA type ends between the connectors on the amplifier and the RCA type signal connectors on the source unit If your radio has only speaker level outputs you must purchase a speaker level to line level adapter commonly sold as an accessory System Setup and Adiustment Refer to figures 1 4 for location of adiustment switches and controls Electronic Crossover for LC A752 and LC A504 The electronic crossover can be selected as a 12dB oct high pass filter HPF 12dB oct low
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