JL Audio M6450 User Manual

Thank you for purchasing a JL Audio amplifier for
your marine sound system.
Your amplifier has been designed and manufactured to exacting
standards in order to ensure years of musical enjoyment in your vessel.
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
M6450
six-channel marine amplifier

JL Audio M6450 Specifications

General

Brand	JL Audio
Model	M6450
Category	Amplifier
Language	English

Summary

Protect Your Hearing

Planning Your Installation

Stupid Mistakes to Avoid

Installation Procedure

Power and Ground Connections

Steps for connecting power/ground wires, fusing, and safety precautions.

Final Checks and Setup

Mounting, initial power-up, and input sensitivity adjustment for optimal sound.

Fuse Requirements

Turn-On Lead

Input Section Overview

Input Signal Routing Options

Input Sensitivity Adjustment

Using controls to match source unit voltage for maximum clean output.

Filter Controls Explained

Details on using Low-Pass (LP) and High-Pass (HP) filters for frequency management.

Filter Mode and Frequency Selection

Bass Boost Controls

Speaker Outputs

Bridging Considerations

Bridging for Increased Power

How to combine channels for higher power output into 4 or 8 ohm loads.

Amplifier Status Indicator Lights

Protection Circuitry

System Configurations

Bi-Amplified Systems

Defining bi-amplified systems and their application with the M6450.

Bi-Amplified System with the M6450

How to configure the M6450 for bi-amplified systems (LF and HF speakers).

Crossover Setup for Bi-Amplified System

Input Sensitivity Level Setting

The Nine-Step Procedure

Detailed steps for adjusting input sensitivity for maximum low-distortion output.

M6450 Specifications

Amplifier Section

Amplifier Filter

Troubleshooting

Amplifier Does Not Turn On

Distorted or Attenuated Sound

Fluctuating Output

Amplifier Shuts Off at Higher Volumes

Amplifier Turns On, No Output

Limited Warranty - Amplifiers (USA)