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Legacy LA790 - User Manual

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Summary

Specifications

Output Power Ratings

Lists RMS and maximum output power for various models and impedance loads.

Frequency Response

Specifies the range of audio frequencies the amplifier can accurately reproduce.

Input Impedance

Details the impedance requirements for both low-level and high-level audio inputs.

Input Sensitivity

Indicates the voltage levels required from the head unit for proper operation.

Power Supply Voltage Requirements

Specifies the operational voltage range and ground requirements for the amplifier.

Matching Speaker Impedance

Lists acceptable speaker impedance for stereo and bridged mono configurations.

Maximum Current Draw

Shows the maximum electrical current the amplifier can consume under load.

Amplifier Dimensions

Provides the physical dimensions (Width x Height x Length) of the amplifiers.

Net Weight

Indicates the weight of the amplifiers in pounds and kilograms.

Features and Controls LA190

Speaker Terminals

Gold-plated terminals for high conductivity and easy wiring in tight situations.

Fuse Protection

Protects the amplifier and vehicle electrical system from short circuit conditions.

Power Supply Terminals

Terminals for connecting the amplifier to the vehicle's power source.

High Level Input

Connects to car stereo speaker outputs if RCA jacks are unavailable.

Low Level Input

Connects to RCA outputs from the head unit using patch cords.

Input Level Control

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

Power LED Indicator

Illuminates when the REMOTE ON system is activated.

Features and Controls LA290

Speaker Terminals

Gold-plated terminals for high conductivity and easy wiring in tight situations.

Fuse Protection

Protects the amplifier and vehicle electrical system from short circuit conditions.

Power Supply Terminals

Terminals for connecting the amplifier to the vehicle's power source.

High Level Input

Connects to car stereo speaker outputs if RCA jacks are unavailable.

Low Level Input

Connects to RCA outputs from the head unit using patch cords.

Input Level Control

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

Power LED Indicator

Illuminates when the REMOTE ON system is activated.

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

Speaker Terminals

Gold-plated terminals for high conductivity and easy wiring in tight situations.

Fuse Protection

Protects the amplifier and vehicle electrical system from short circuit conditions.

Power Supply Terminals

Terminals for connecting the amplifier to the vehicle's power source.

Input Level Control

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

Crossover Mode Switch

Selects full range, high-pass filter (HPF), or low-pass filter (LPF).

Bass Boost Control

Increases the bass signal level sent to the 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

Connects to car stereo speaker outputs if RCA jacks are unavailable.

Low Level Input

Connects to RCA outputs from the head unit using patch cords.

Power LED Indicator

Illuminates when the REMOTE ON system is activated.

Protection LED Indicator

Illuminates when amplifier is disabled due to overload or thermal issues.

Remote Bass Boost Connection

Connection point for the optional remote bass boost control.

Features and Controls LA690;890

Speaker Terminals

Gold-plated terminals for high conductivity and easy wiring in tight situations.

Fuse Protection

Protects the amplifier and vehicle electrical system from short circuit conditions.

Power Supply Terminals

Terminals for connecting the amplifier to the vehicle's power source.

Input Level Control

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

Crossover Mode Switch

Selects full range, high-pass filter (HPF), or low-pass filter (LPF).

Bass Boost Control

Increases the bass signal level sent to the 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

Connects to car stereo speaker outputs if RCA jacks are unavailable.

Low Level Input

Connects to RCA outputs from the head unit using patch cords.

Power LED Indicator

Illuminates when the REMOTE ON system is activated.

Protection LED Indicator

Illuminates when amplifier is disabled due to overload or thermal issues.

Remote Bass Boost Connection

Connection point for the optional remote bass boost control.

Electrical Wiring and Installation

Making Power Connections

Instructions for connecting the amplifier's power, ground, and remote terminals.

Installation Precautions

Important safety and installation guidelines for mounting the amplifier.

Setting Up and Turning On

Steps for initial setup, including adjusting level controls and checking for noise.

Input Connections

Low Level Stereo Input

Diagram showing how to connect a stereo head unit using RCA cables.

High Level Stereo Input

Diagram showing how to connect using speaker wires from the head unit.

4 Channel Input Connections

Low Level 4 CH Stereo Input from 2 CH Source

Connecting a 2-channel head unit to a 4-channel amplifier using Y adapters.

Low Level 4 CH Stereo Input from 4 CH Source

Connecting a 4-channel head unit to a 4-channel amplifier.

High Level 4 CH Input Connections

High Level 4 CH Stereo Input from 4 CH Source (Rear;Front)

Diagram showing high-level connection for 4-channel amps using speaker wires.

Bridged Input Connections

Bridged Input Connection (2 CH Amps)

Diagram for connecting a 2-channel head unit in bridged mode for 2CH amplifiers.

4 CH Bridged Input from 2 CH Source

Connecting a 2-channel head unit for bridged 4-channel operation.

Speaker Connections

Basic Stereo Output

Diagram showing how to connect left and right speakers for stereo output.

Basic 4 CH Output

Diagram showing how to connect front and rear speakers for 4-channel output.

Mono-Bridged Speaker Connections

Bridged Mono Output (2 CH Amps)

Diagram for connecting a single speaker in bridged mono mode (min 4 Ohms).

2 CH Mono-Bridged Output (4 CH Amps)

Diagram for connecting speakers in bridged mono mode (min 4 Ohms) for 4CH amps.

Troubleshooting

Amplifier Will Not Power Up

Checks for power, ground, fuse, and protection LED issues when amplifier is dead.

High Hiss or Engine Noise

Diagnosing and resolving noise issues like alternator whine or ground loops.

Protection LED Comes On

Troubleshooting steps when the protection indicator is illuminated.

Amplifier Gets Very Hot

Identifying causes for overheating, such as impedance or airflow issues.

Distorted Sound

Troubleshooting distorted audio output from the amplifier.

High Squeal Noise from Speakers

Resolving high-frequency squeal, often caused by RCA cable grounding.

Warranty and Support

Manufacturers Limited Warranty

Details the two-year warranty terms, exclusions, and return procedures.

Technical Support Hotline

Contact information and operating hours for technical assistance.

Legacy LA790 Specifications

General IconGeneral
Channels4
Signal to Noise Ratio>90dB
THD at RMS Output<0.05%
Fuse Rating25A
Frequency Response20Hz-20kHz
Input Sensitivity200mV-6V

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