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JL Audio NexD M600/6 User Manual

JL Audio NexD M600/6
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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, 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
600W Marine 3/4/5/6 Channel Amplier
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JL Audio NexD M600/6 Specifications

General IconGeneral
Amplifier ClassClass D
Channels6
RMS Power (4 Ohms)75 W x 6
RMS Power (2 Ohms)100 W x 6
Bridged RMS Power (4 Ohms)200 W x 3
THD+N< 0.05%
Input Sensitivity200 mV - 4 V
Damping Factor> 200
Fuse Rating40 A
Crossover Slope12 dB/octave

Summary

Protect Your Hearing

Planning Your Installation

Typical Installation Sequence

Disconnect Battery

Crucial first step to disconnect the negative battery post to prevent accidental re-connection.

Run Power Wire

Instructions for running 4 AWG power wire from the battery, recommending a distribution block for multiple amps.

Connect Power Wire to Battery

Details connecting power wire to the positive battery post and installing an inline fuse within 18 inches.

Connect Negative Power Wire

Advises connecting the negative power wire using the same gauge as the positive wire (minimum 4 AWG).

Connect Power Wires to Amplifier

Connects positive and negative power wires to the amplifier, noting fuse requirements for shared power.

Review Control Settings

Recommends reviewing amplifier control settings for system needs.

Install Power Wire Fuse

Instructions for installing the main power wire fuse (50A) and reconnecting the battery.

Initial Power-On Test

Advises turning on the source unit at low level to verify amplifier configuration.

Adjust Input Sensitivity

Adjusts input sensitivity controls for optimal output and system balance, referencing Appendix A.

Power Connections and Fusing

Wire Gauge Requirements

Specifies 4 AWG power wire for +12 VDC and Ground connections, and recommends larger gauges for multiple amps.

Connecting Power Wires

Details the process of connecting power wires using set screws and hex wrenches.

Ground Connection

Emphasizes using the same gauge wire for ground as power and protecting wires through barriers with grommets.

Fuse Requirements

Stresses fusing the main power wire within 18 inches of the battery post with a 50A fuse for the M600/6.

Turn-On Lead Operation

Input Section Configuration

Input Mode Switch

Explains the 'Input Mode' switch for 2, 4, or 6 channel operation and signal summing.

Input Sensitivity Controls

Describes using 'Input Sens.' controls to match source voltage to amplifier input for maximum clean output.

Adjusting Input Sensitivity

Advises referring to Appendix A for setting input sensitivity and warns against exceeding maximum levels.

Filter Controls Explained

Filter Functionality

Explains filters select frequency ranges for speakers, active filters are preferred for subwoofers and satellites.

Active Filter Purpose

Describes how active filters eliminate harmful frequencies to improve tonal balance, avoid distortion, and prevent speaker failure.

Filter Mode Control

Details the three-position 'Filter Mode' switch (Off, LP, HP) for attenuating frequencies.

Filter Frequency Selection

Explains the 'Filter Freq. (Hz)' rotary control for selecting cutoff frequencies and refers to Appendix B for precision.

Tuning Hint for Filters

Suggests 80 Hz as a baseline for subwoofer/satellite systems and fine-tuning filters after setting input sensitivity.

Speaker Outputs and Bridging

Speaker Wire Gauge and Impedance

Advises using 16 AWG - 8 AWG wire for speaker outputs and notes impedance recommendations.

Status LED and Protection Circuitry

System Configurations

Appendix A: Input Sensitivity Level Setting

Nine-Step Sensitivity Procedure

Provides a step-by-step guide for adjusting input sensitivity for maximum low-distortion output.

Important Sensitivity Note

Warns against increasing 'Input Sens.' beyond the maximum level established during setup to avoid distortion.

Appendix B: Frequency Selection Chart

Appendix C: M600/6 Specifications

Appendix D: Troubleshooting

Amplifier Not Turning On

Troubleshooting steps for an amplifier that does not turn on, checking fuses, connections, and remote voltage.

Amplifier Shuts Off at High Volumes

Troubleshoots sudden shutdowns at high volumes by checking voltage source, grounding, and potential wiring upgrades.

No Output

Guides on diagnosing no output by checking input signal voltage and amplifier output at speaker terminals.

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