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Legacy LA690 - User Manual

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Summary

Features and Controls LA190

Speaker Terminals

Gold-plated terminals for high conductivity and minimum impedance loss.

Fuse

Protects amplifier and automobile electrical system from short circuits.

Power Supply Terminals

Terminals for connecting the power supply to the amplifier.

High Level Input (Low Impedance)

Connects speaker outputs from head unit when no RCA outputs are available.

Low Level Input (High Impedance)

Gold-plated RCA jacks for connecting head unit RCA outputs.

Input Level Control

Matches head unit output to amplifier; reduce if distortion occurs.

Power LED Indicator

Illuminates when the REMOTE ON system is turned on.

Features and Controls LA290

Speaker Terminals

Gold-plated terminals for high conductivity and minimum impedance loss.

Fuse

Protects amplifier and automobile electrical system from short circuits.

Power Supply Terminals

Terminals for connecting the power supply to the amplifier.

High Level Input (Low Impedance)

Connects speaker outputs from head unit when no RCA outputs are available.

Low Level Input (High Impedance)

Gold-plated RCA jacks for connecting head unit RCA outputs.

Input Level Control

Matches head unit output to amplifier; reduce if distortion occurs.

Power LED Indicator

Illuminates when the REMOTE ON system is turned on.

Features and Controls LA490;590;790;1490;1990

Speaker Terminals

Gold-plated terminals for high conductivity and minimum impedance loss.

Fuse

Protects amplifier and automobile electrical system from short circuits.

Power Supply Terminals

Terminals for connecting the power supply to the amplifier.

Input Level Control

Matches head unit output to amplifier; reduce if distortion occurs.

Crossover Mode Switch

Selects FULL, HPF, or LPF mode for crossover system.

Bass Boost Control

Adjusts bass signal level sent to speakers.

Low Pass Control

Adjusts crossover frequency (35 Hz to 350 Hz) for subwoofers.

High Pass Control

Adjusts crossover frequency (80 Hz to 2.5 kHz) for tweeters.

High Level Input (Low Impedance)

Connects speaker outputs from head unit when no RCA outputs are available.

Low Level Input (High Impedance)

Gold-plated RCA jacks for connecting head unit RCA outputs.

Power LED Indicator

Illuminates when the REMOTE ON system is turned on.

Protection LED Indicator

Illuminates when overload, short circuit, or thermal conditions occur.

Remote Bass Boost

Port for connecting the remote bass boost control wire.

Features and Controls LA690;890

Speaker Terminals

Gold-plated terminals for high conductivity and minimum impedance loss.

Fuse

Protects amplifier and automobile electrical system from short circuits.

Power Supply Terminals

Terminals for connecting the power supply to the amplifier.

Input Level Control

Matches head unit output to amplifier; reduce if distortion occurs.

Crossover Mode Switch

Selects FULL, HPF, or LPF mode for crossover system.

Bass Boost Control

Adjusts bass signal level sent to speakers.

Low Pass Control

Adjusts crossover frequency (35 Hz to 350 Hz) for subwoofers.

High Pass Control

Adjusts crossover frequency (80 Hz to 2.5 kHz) for tweeters.

High Level Input (Low Impedance)

Connects speaker outputs from head unit when no RCA outputs are available.

Low Level Input (High Impedance)

Gold-plated RCA jacks for connecting head unit RCA outputs.

Power LED Indicator

Illuminates when the REMOTE ON system is turned on.

Protection LED Indicator

Illuminates when overload, short circuit, or thermal conditions occur.

Remote Bass Boost

Port for connecting the remote bass boost control wire.

Electrical Connections and Setup

Making Power Connections

Guide for connecting +12V, Ground, and REMOTE terminals for amplifier power.

Installation Precautions

Safety and installation advice to prevent damage and ensure proper function.

Setting Up and Turning On Your New Amplifier

Steps for initial setup and adjusting level controls for optimal performance.

Input Connections for 2 CH AMPS

Low Level Stereo Input Connection

Diagram showing RCA cable connections for low-level stereo inputs.

High Level Stereo Input Connection

Diagram showing speaker wire connections for high-level stereo inputs.

Low Level Input Connections for 4 CH AMPS

Low Level 4 CH Stereo Input from 2 CH Audio Source

Shows Y-adapter usage for 4CH amps from a 2CH source.

Low Level 4 CH Stereo Input from 4 CH Audio Source

Shows direct connection for 4CH amps from a 4CH source.

High Level Input Connections for 4 CH AMPS

High Level 4 CH Stereo Input from 4 CH Audio Source (Front)

Connects front speaker outputs from head unit to 4CH amp high-level inputs.

High Level 4 CH Stereo Input from 4 CH Audio Source (Rear)

Connects rear speaker outputs from head unit to 4CH amp high-level inputs.

Bridged Input Connections

Bridged Input Connection for 2 CH AMPS

Shows how to connect for bridged mono operation on 2CH amps.

4 CH Bridged Input from 2 CH Audio Source

Shows how to achieve 4CH bridged input from a 2CH source.

Speaker Connections

Basic Stereo Output

Illustrates connecting speakers for basic stereo operation on 2CH amps.

Basic 4 CH Output

Illustrates connecting speakers for basic 4CH operation.

Mono-Bridged Speaker Connections

Bridged Mono Output

Connects a single speaker for bridged mono output, minimum 4 Ohms.

2 CH Mono-Bridged Output

Connects speakers for 2CH mono-bridged output, minimum 4 Ohms.

Troubleshooting

Amplifier will not power up

Checks for power, ground, fuses, and protection LED status.

High hiss or engine noise (alternator whine)

Guides on isolating noise sources and setting input levels.

Protection LED comes on when amplifier is powered up

Troubleshoots speaker shorts, volume settings, and faulty amplifiers.

Amplifier(s) gets very hot

Checks impedance, shorts, and airflow for overheating issues.

Distorted sound

Checks level controls, crossover frequencies, and speaker shorts.

High squeal noise from speakers

Identifies poorly-grounded RCA patch cords as the common cause.

Manufacturers Limited Two Year Warranty

Warranty Coverage

Details the two-year limited warranty for material and workmanship defects.

Returning Unit for Service

Instructions for packing, including required documentation and fees.

Technical Support Hotline

Provides contact information for technical assistance and operating hours.

Legacy LA690 Specifications

General IconGeneral
Channels6
THD<0.05%
Frequency Response20Hz - 20KHz
RMS Power at 4 Ohms60W x 6
Input Impedance10k Ohms
Fuse Rating25A

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