JL Audio JX400/4D User Manual

Thank you for purchasing a JL Audio amplifier for
your automotive sound system.
Y
our 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.
I
f you have any questions regarding the instructions in this
manual or any aspect of your amplifier’s operation, please contact your
a
uthorized JL Audio dealer for assistance. If you need further assistance,
please call our Technical Support Department
at (954) 443-1100 during business hours.
OWNER’S MANUAL
400W 4-Channel, Class D, 4 Channel Amplifier

JL Audio JX400/4D Specifications

General

Amplifier class	D
High pass filter	Yes
RMS output power (max)	400 W
Signal-to-Noise Ratio (SNR)	76 dB
Number of amplifier channels	4 channels
RMS power output per channel (2 Ohm)	100 W
RMS power output per channel (4 Ohm)	70 W
Product color	Black, Silver

Weight and Dimensions

Depth	195 mm
Width	230 mm
Height	55 mm
Weight	2180 g

Summary

Protect Your Hearing

Installation Applications

Planning Your Installation

Safety Considerations

Important safety guidelines for mounting and integrating the amplifier into the vehicle.

Stupid Mistakes to Avoid

Typical Installation Sequence

Power Connections

Fuse Requirements

Information on essential fuse requirements for vehicle safety and amplifier protection.

Input Sections

Bridging the Amplifier

Input Sensitivity Controls

Filter Controls

Speaker Outputs

Bridging Considerations

Amplifier Status Indicator Lights & Protection Circuitry

Input Sensitivity Level Setting

Troubleshooting

"My amplifier doesn't turn on"

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

"My amplifier turns on, but there is no output"