JL Audio Slash 300/4 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 (Eastern Time Zone).
JL AUDIO 300/4
four-channel full-range amplifier
owner’s manual

JL Audio Slash 300/4 Specifications

General

Power Output (4 Ohm)	75W x 4
Power Output (2 Ohm)	150W x 4
Bridged Power Output (4 Ohm)	300W x 2
THD at Rated Power	< 0.03%
Dimensions (L x W x H)	9.5" x 2.25"
Input Voltage Range	200mV
Crossover	12dB/octave
Fuse Rating	30A

Summary

Safety and Installation Planning

Protect Your Hearing

Installation Planning Considerations

Product Description and Installation Steps

Typical Installation Sequence

Power Connections

Outlines the procedure and precautions for connecting the amplifier's power supply.

Fuse Requirements

Specifies the essential fuse value and type for protecting the amplifier and vehicle.

Input and Crossover Controls

Input Section Controls Overview

Crossover Filter Controls

Describes how to use the built-in filters to direct frequency ranges to specific speakers.

Speaker Outputs and Bridging

Speaker Outputs and Impedance

Explains the amplifier's impedance handling and how speaker loads affect power output and protection.

Bridging Considerations

Details how to combine amplifier channels for increased power output to a single speaker.

System Operation and Configurations

Status Indicator Lights

System Configurations

Bi-Amplified System with One 300/4

Advanced System Configurations

Crossover Setup for Bi-Amplified System with one 300/4

Bi-Amplified System with Separate Subwoofer Amplifier

Crossover Setup for Combined System

Setup Appendices

Appendix B: Input Sensitivity Setting

Offers a detailed procedure for setting input sensitivity for optimal performance.

Nine-Step Procedure

A step-by-step guide to accurately set the amplifier's input sensitivity using test tones and a voltmeter.

Input Sensitivity Reference Listings

Optimum Configurations

Tables showing target voltages for ideal speaker load configurations for maximum power output.

Sub-Optimum Configurations

Troubleshooting Guide

No Power / No Output

Guides on diagnosing why the amplifier fails to power up or produce sound, checking voltage and signals.

Distorted or Fluctuating Sound

Helps resolve issues of poor sound quality, checking speaker wires, shorts, and connections.

Intermittent Shutdown

Setting Input Sensitivity

300/4 Amplifier Specifications

General and Input Specifications

Amplifier and Filter Specifications