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JL AUDIO 

A1800

 

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JL AUDIO 

A1800

SERVICING YOUR JL AUDIO AMPLIFIER

If your amplifier fails or malfunctions, please 

return it to your authorized JL Audio dealer so 
that it may be sent in to JL Audio for service. 
There are no user serviceable parts or fuses inside 
the amplifier. The unique nature of the circuitry 
in the JL Audio amplifiers requires specifically 
trained service personnel. Do not attempt 
to service the amplifier yourself or through 
unauthorized repair facilities. This will not only 
void the warranty, but may result in the creation 
of more problems within the amplifier. 

If you have any questions about the installation or 

setup of the amplifier not covered in this manual, 

please contact your dealer or technical support.

JL Audio Technical Support

(954) 443-1100 

9:00 AM – 5:30 PM (Eastern Time Zone)

Monday - Friday

AMPLIFIER STATUS INDICATOR LIGHTS & 
PROTECTION CIRCUITRY

There are two status indicator lights on the 

input / control end of the amplifier.

Power

Protect

1)  “Power” (Green):

 lights to indicate that the 

amplifier is turned on and operating normally. 

2)  “Protect” (Red)

: Indicates that the amplifier 

protection circuitry has been activated to 
prevent product failure due to a short-circuit or 
a dangerously low impedance connected to the 
amplifier output(s). Connecting the speaker 
outputs to an impedance lower than 2 ohms 
will cause this protection mode to activate. 
When this protection mode is activated, the 
amplifier will reduce it maximum power 
output to protect its circuitry, which will 
manifest itself as increased distortion. When 
the problem is corrected, the amplifier will 
return to normal operation.

Advanced Rollback Thermal protection

Unlike conventional thermal protection 

systems, which shut down an amplifier when it 
overheats, this system protects the amplifier by 
gradually reducing power output if the amplifier’s 
safe operating temperature is exceeded. The 
amplifier will continue to operate and return 
to normal power output once its temperature 
returns to a normal range.

Low-Voltage protection:

 

If the car’s supply voltage drops below 10 

volts, the entire amplifier will shut itself off to 
protect its internal circuitry. The green “

Power

” 

indicator will turn off when this occurs. The 
amplifier will turn back on when voltage climbs 
back above 10 volts. This may happen in a rapid 
cycle when bass-heavy program material causes 
a weak charging system to dip below 10 volts 
momentarily. If this is happening in your system, 
turn your audio system off and have your power 
wiring, ground connections and charging 
system inspected. 

Summary of Contents for A1800

Page 1: ...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...

Page 2: ...e roof or in any other area that will expose the amplifier circuitry to the elements JL AUDIO A1800 3 PROTECT YOUR HEARING We value you as a long term customer For that reason we urge you to practice...

Page 3: ...The JL Audio A1800 is a monoblock subwoofer amplifier utilizing proprietary and patented Class D technology Its frequency response is limited to the range below 250 Hz It is not designed for driving m...

Page 4: ...ss speakers in the system Experiment to find the slope which best matches the acoustic requirements of your system JL AUDIO A1800 7 TURN ON LEAD The A1800 uses a conventional 12V remote turn on lead t...

Page 5: ...r bass content pass through A sub that fires directly into the listening environment is more likely to benefit from a 24 dB octave slope Note The above hint is not set in stone You should always liste...

Page 6: ...re due to a short circuit or a dangerously low impedance connected to the amplifier output s Connecting the speaker outputs to an impedance lower than 2 ohms will cause this protection mode to activat...

Page 7: ...r that set of channels 50 Hz for subwoofer channels 1 kHz for a midrange application Do not use attenuated test tones 10 dB 20 dB etc The Nine Step Procedure 1 Disconnect the speaker s from the amplif...

Page 8: ...ith the metal inside the terminal block The speaker wire connectors are designed to accept up to 8 AWG wire Make sure to strip the wire to allow for a sufficient connection with the metal inside the t...

Page 9: ...ES Use this diagram to document your amplifier s switch and control positions Bass Boost Controls Input Voltage Low High CH 1 Left Input Sens LP Filter Filter Freq Hz 40 45 55 65 80 100 200 Bass Boost...

Page 10: ...JL AUDIO A1800 19 18 JL AUDIO A1800 INSTALLATION NOTES INSTALLATION NOTES...

Page 11: ...tions on implied warranties therefore these exclusions may not apply to you This warranty gives you specific legal rights and you may also have other rights which vary from state to state If you need...

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