JL Audio JD250/1 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, 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 contact the JL Audio Technical Support Department
at technical@jlaudio.com/support.
OWNER’S MANUAL
Class D Monoblock Subwoofer Amplifiers
250/1

JL Audio JD250/1 Specifications

General

Fuse Rating	25 A
Rated Power (RMS)	250 Watts x 1 @ 4 ohms
Input Range	200 mV - 6 V
Power Output (RMS)	250W @ 1.5Ω - 4Ω
Input Sensitivity	200 mV - 6 V

Summary

Safety and Identification

Protect Your Hearing

Advises users to limit exposure to high sound pressure levels to prevent permanent hearing loss.

Record Your Serial Number

Instructions to record the product's serial number for service or theft purposes.

Installation Planning and Product Details

Installation Applications & Planning

Covers vehicle system compatibility, installation planning, cooling, safety, and common mistakes.

Product Information

Lists included items and provides a product description of the amplifiers.

Installation Procedure and Power

Typical Installation Sequence

Provides a step-by-step guide for installing the amplifier in a vehicle.

Power Connections

Details the procedure for safely connecting the amplifier's power supply wires.

Wiring and Fusing

Power and Ground Wire Gauge

Specifies minimum wire gauge requirements for power and ground connections and important notes on wire types.

Fuse Requirements

Lists the recommended fuse values for each amplifier model and emphasizes proper fuse placement.

Turn-On Options

Amplifier Turn-On Methods

Explains the three methods for turning the amplifier on/off: +12V Remote, DC Offset-Sensing, and Signal-Sensing.

Input and Voltage Settings

Input Section

Describes the differential-balanced input topology and how to connect stereo or mono signals.

Input Voltage Range

Explains the 'Low' and 'High' input voltage settings for preamp and speaker-level signals.

Control Adjustments

Input Sensitivity Controls

Details how to use the 'Input Sens.' control and 'Clipping' LED for setting input sensitivity.

Low-Pass Filter Control

Explains the function and operation of the active low-pass filter for subwoofer frequency control.

Audio Controls and Outputs

Bass Boost and Remote Level Control

Covers the Bass Boost equalizer and the optional Remote Level Control (RBC-1).

Preouts

Details the buffered pass-through preamp outputs for connecting additional amplifiers.

Outputs and Status Indicators

Subwoofer Outputs

Describes the subwoofer output terminals, their parallel connection, and impedance recommendations.

Status and Protection LEDs

Explains the meaning of the Status LED and the Protection LED (constant/flashing red).

Troubleshooting and Servicing

Unexpected Amplifier Shutdowns

Discusses conditions causing unexpected shutdowns, primarily low voltage, and suggests inspection.

Servicing Your Amplifier

Provides instructions for returning the amplifier for service, emphasizing authorized service personnel.

Appendix A: Input Sensitivity Level Setting

Input Sensitivity Level Setting Procedure

Step-by-step guide to properly adjust amplifier input sensitivity for optimal system balance.

Appendix B: Specifications

Amplifier Specifications

Detailed technical specifications for JD250/1, JD500/1, and JD1000/1 models.

Appendix C: Troubleshooting

Common Troubleshooting Issues

Addresses common problems like no turn-on, ticking sounds, and fluctuating output.

Limited Warranty Information

USA Limited Warranty Terms

Details the warranty period, coverage, exclusions, and service procedures for USA customers.