Legacy LA470 - User Manual

LA370
LA470
LA570
LA670
LA770
LA870
LA970
LA1470
LA1870
LA2070
WARRANTY
LEGACY SOUND CORP. warrants this unit to be free from defective material or workmanship and will repair or
replace this unit or any part thereof if it proves defective in normal use or service within two (2) years from the
date of original purchase.
Our obligation under this warranty is limited to repairing or replacing, at our discretion, the defective instrument
or any part thereof when it is returned, transportation prepaid to the Legacy Service Center at the address
below. This warranty will be considered void if the unit has been tampered with, improperly serviced, subjected
to abuse or misuse or if installed in a commercial vehicle. This warranty does not cover accidental damage.
When returning this unit for service, please include $15.00 for return postage and handling. Send your unit to:
LEGACY SERVICE CENTER
1600 63rd Street
Brooklyn, NY 11204
IMPORTANT: Pack carefully in original carton if possible. We are not
responsible for damage incurred in returning items for repair. A letter
stating your exact street address, daytime phone number, and the
problem you are experiencing should be included. You must also enclose
a copy of the original receipt as proof of date of purchase.
FOR YOUR PROTECTION
Completely and immediately mail the Product Registration Card
so that we may contact you directly in the event a safety
notification is issued in accordance with the 1972 Consumer
Product Safety Act, or for other reasons Legacy may deem
necessary.
TECHNICAL SUPPORT HOTLINE
Our technical department will gladly answer any questions
you may have about our products. They cannot, however
tell you the status of a repair, or handle other customer
service situations.
1-800-934-2277
Monday through Thursday, 9AM to 5PM
Friday 9AM to 2PM Eastern.
MANUFACTURER’S LIMITED TWO YEAR
CAR AMPLIFIER
HIGH SPEED
www.legacycaraudio.com

Summary

Manufacturers Limited Two Year Warranty

Technical Support Hotline

Provides assistance for product questions but cannot track repair status or handle customer service.

Legacy Red Series 2 Amplifier Features

Specifications Table

Details output power, impedance, input sensitivity, and dimensions for various amplifier models.

Amplifier Features and Controls

Speaker Terminals

14K Gold plated for conductivity and minimum impedance loss, facing upwards for easy wiring.

Fuse

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

Power Supply Terminals

Connection points for the main power source to the amplifier.

Input Level Control

Matches head unit output to amplifier; reduce if distortion is present.

Crossover Mode Switch

Allows selection of FULL, HPF, or LPF for crossover system use.

Bass Boost Control

Enables increasing the bass signal level sent to the speakers.

Low Pass Control

Adjusts crossover frequency from 35 Hz to 400 Hz for subwoofers.

High Pass Control

Adjusts crossover frequency from 80 Hz to 2.5 kHz for tweeters.

High Level Input (Low Impedance)

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

Low Level Input (High Impedance)

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

Power LED Indicator

Illuminates when the REMOTE ON system is turned on.

Protection LED Indicator

Illuminates if overload, short circuit, or thermal conditions occur, disabling the amp.

Remote Bass Boost

Connection point for the optional Remote Bass Boost Control wire.

Electrical Wiring and Installation

Power Connections

Guidelines for connecting the +12V, GROUND, and REMOTE terminals for amplifier operation.

Installation Precautions

Advisories on mounting, ventilation, wire protection, and fuse replacement.

Setting Up and Turning On Your New Amplifier

Steps for initial setup, including adjusting level controls for optimal sound and noise reduction.

Low Level Stereo Input Connection

Diagram and explanation for connecting the amplifier using RCA output from the head unit.

High Level Stereo Input Connection

Diagram and explanation for connecting the amplifier using speaker outputs from the head unit.

Input Connections for 4-Channel Amplifiers

Low Level 4 CH Stereo Input (2 CH Source)

Wiring diagram for using Y-adapters to connect a 2-channel source to a 4-channel amp.

High Level 4 CH Stereo Input (Floating Ground)

Wiring diagram for high-level inputs with a floating ground connection from a 4-channel source.

Low Level 4 CH Stereo Input (4 CH Source)

Wiring diagram for connecting a 4-channel source directly to a 4-channel amplifier.

High Level 4 CH Stereo Input (Common Ground)

Wiring diagram for high-level inputs with a common ground connection from a 4-channel source.

Speaker Connections

Bridged Input Connection

Diagram showing how to connect for bridged operation using Y-adapters from the head unit.

4 CH Bridged Input (2 CH Source)

Wiring for 4-channel bridged input using Y-adapters from a 2-channel source.

Basic Stereo Output

Diagram illustrating standard stereo speaker connections to the amplifier.

Basic 4 CH Output

Diagram showing standard speaker connections for a 4-channel amplifier setup.

Speaker Connections (Continued)

Bridged Mono Output

Diagram for connecting a single speaker in bridged mono configuration.

2 CH Mono-Bridged Subwoofer Output

Diagram for connecting a subwoofer in a 2-channel mono-bridged configuration.

2 CH Stereo plus Mono-Bridged Subwoofer Output

Diagram showing stereo speaker and mono-bridged subwoofer connections.

Troubleshooting

Amplifier Will Not Power Up

Checks for power, ground, remote connection, and fuses if the amplifier does not turn on.

High Hiss or Engine Noise

Procedure to isolate hiss or alternator whine by disconnecting inputs and checking connections.

Protection LED Comes On

Troubleshooting steps for when the Protection LED is illuminated, checking for shorts or volume.

Amplifier(s) Gets Very Hot

Checks for correct impedance, speaker shorts, and adequate airflow for overheating issues.

Distorted Sound

Guidance on setting input levels, crossover frequencies, and checking for speaker shorts.

High Squeal Noise

Identifies high squeal noise as typically caused by a poorly-grounded RCA patch cord.

Legacy LA470 Specifications

General

Brand	Legacy
Model	LA470
Category	Car Amplifier
Language	English