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owner’s manual

Monoblock Wide-Range Amplifier

Thank you for purchasing a JL Audio amplifier for  

your automotive sound system. 

Your amplifier has been designed and manufactured to exacting 

standards in order to ensure years of musical enjoyment in your vehicle. 

For maximum performance, we highly recommend that you have 

your new amplifier installed by an authorized JL Audio dealer.  Your 

authorized dealer has the training, expertise and installation equipment 

to ensure optimum performance from this product. Should you  

decide to install the amplifier yourself, please take the time  

to read this manual thoroughly so as to familiarize yourself  

with its installation requirements and setup procedures.

If you have any questions regarding the instructions in this  

manual or any aspect of your amplifier’s operation, please contact your 

authorized JL Audio dealer for assistance. If you need further assistance, 

please call the JL Audio Technical Support Department  

at (954) 443-1100 during business hours.

Summary of Contents for HD1200/1

Page 1: ...dealer has the training expertise and installation equipment to ensure optimum performance from this product Should you decide to install the amplifier yourself please take the time to read this manua...

Page 2: ...and on the amplifier packaging Serial Number Installation Applications This amplifier is designed for operation in vehicles with 12V negative ground electrical systems Use of this product in vehicles...

Page 3: ...utVoltage Selection pg 9 Remote Level Control Speaker Outputs pgs 13 14 Jack for mote Level ntrol Knob pg 13 Safety Considerations Your amplifier needs to be installed in a dry well ventilated environ...

Page 4: ...nd 1200 1 to form a stereo pair Its effective frequency response is from 6 Hz very low bass to 8 kHz lower treble range JL Audio s exclusive R I P S power supply design optimizes the output the amplif...

Page 5: ...on wire from the source unit or interface processor to the amplifier mounting location 5 Run speaker wire from the speaker systems to the amplifier mounting location 6 Find a good solid bare metal gr...

Page 6: ...and should connect to the HD1200 1 with 4 AWG pure copper power wire Please note that lower AWG numbers mean bigger wire and vice versa 1 0 AWG is the largest 2 AWG is smaller then 4 AWG then 8 AWG e...

Page 7: ...designed to accept 18 AWG 12 AWG wire 18 AWG is more than adequate for this purpose To connect the remote turn on wire to the amplifier first back out the set screw on the bottom of the Power Connecto...

Page 8: ...holes in your vehicle to make sure that you will not be drilling through a gas tank brake line wiring harness or other vital vehicle system ConTROL PAnel SECURITY CoVER The HD1200 1 features a Control...

Page 9: ...itivity of the HD1200 1 to the specific signal source that is feeding it and must be adjusted with care following the procedures outlined in this manual Failure to make correct adjustments can result...

Page 10: ...ing for any amplifier in the system beyond the maximum level established during the procedure outlined in Appendix C pages 18 19 Doing so will result in audible distortion and possible speaker damage...

Page 11: ...tion of slopes which best matches the acoustic requirements of your system 3 Filter Freq Hz Control This control selects the frequency at which the filter begins to attenuate the signal and refers spe...

Page 12: ...moothness and impact to make your determination If you change crossover slopes or crossover filter frequencies you may need to revisit this control as these can affect the phase of the speaker systems...

Page 13: ...er Speaker CONNECTIONS The HD1200 1 employs JL Audio s exclusive Regulated Intelligent Power Supply R I P S design This sophisticated power supply allows the amplifier to produce its optimum power 120...

Page 14: ...h sets of connections Do not chassis ground any speakers connected to this or any other JL Audio amplifier Doing so will cause the amplifier to go into protection and mute the output Status LED Protec...

Page 15: ...found with the supply voltage to the amplifier and you are still seeing alternating Red and Green on the Status LED it is likely that the amplifier is suffering from an internal fault that requires fa...

Page 16: ...16 JL Audio HD1200 1 Owner s Manual...

Page 17: ...500 4 per ch 50 Hz 250 2 per ch 50 Hz Crossover Filter Filter Type State variable 12 dB octave Butterworth or 24 dB octave Linkwitz Riley Filter Modes Low Pass or High Pass Defeatable Cutoff Freq Ran...

Page 18: ...pped output is very predictable This makes setting the gain structure via the input sensitivity controls very simple Following the directions below will allow the user to adjust the input sensitivity...

Page 19: ...et voltage for input sensitivity adjustment according to the nominal impedance of the speaker system connected to each set of outputs Nom Impedance HD 1200 1 mono 8 69 3 V 6 69 3 V 4 69 3 V 3 60 0 V 2...

Page 20: ...of the speaker s Check the speaker wires for a possible short either between the positive and negative leads or between a speaker lead and the vehicle s chassis ground If a short is present you will...

Page 21: ...priate test tone is played through the source unit disconnect the input cables from the amplifier prior to this test The frequency used should be in the range that is to be amplified by the amplifier...

Page 22: ...22 JL Audio HD1200 1 Owner s Manual INSTALLATION NOTES Use this diagram to document your amplifier s switch and control positions...

Page 23: ...23...

Page 24: ...this product thereafter Some states do not allow limitations on implied warranties therefore these exclusions may not apply to you This warranty gives you specific legal rights and you may also have o...

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