JL Audio A1800 User Manual

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 and extended warranty
coverage, 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.
OWNER’S MANUAL
A18 0 0
monoblock subwoofer amplifier

JL Audio A1800 Specifications

General

Brand	JL Audio
Model	A1800
Category	Amplifier
Language	English

Summary

Protect Your Hearing

Planning Your Installation

Stupid Mistakes to Avoid

Typical Installation Sequence

Power Connections

Important Electrical Notes

Fuse Requirements

Input Section

Amplifier Controls

Input Sensitivity Adjustment

Details how to use the 'Input Sens.' control to match source unit voltage for maximum clean output.

Filter Controls

Pre-Outs

Speaker Outputs

Speaker Load Considerations

Warns against using speaker loads below 2 ohms to prevent protection mode activation.

Amplifier Status Indicator Lights & Protection Circuitry

Low-Voltage Protection

Advanced Rollback Thermal protection

Low-Voltage Protection

Appendix A: Input Sensitivity Level Setting

The Nine-Step Procedure

Details the nine steps for performing the input sensitivity level setting procedure.

Important Input Sensitivity Note

Appendix C: A1800 Specifications

Appendix D: Trouble Shooting

My amplifier doesn't turn on

Troubleshooting steps for an amplifier that fails to power on, checking fuses and connections.

My amplifier shuts off once in a while, usually at higher volumes

Addresses shutdown issues at high volumes, suggesting checks for voltage source and grounding points.

I get a distorted / attenuated sound coming out of the speaker(s)

Diagnoses distorted or attenuated sound by checking speaker wires, impedance, and input signal.

My amplifier turns on, but there is no output

Guides on checking for input signal voltage and amplifier output voltage when there is no sound.

My amplifier's output fluctuates when I tap on it or hit a bump