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Installing Legacy LA690 Amplifier

Ya I just got a Legacy LA690-American series 2-1000 watt amplifier off of ebay. Its different from my other amplifiers and I just need help on installing it.

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Posted on Aug 09, 2007


matthew nulph

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You have four wires to hook up the amp. First you have a power wire that will run from the positive battery terminal from the battery under the hood. Run that wire from the battery usually through the firewall and all the way to the back of the car. Next you have your remote turn on wire. Its usually a small blue wire but could be any color. You can run that from your head unit "if its aftermarket it will more then likely have a blue wire on the back for it". Next you have your RCA's it has two plugs on each end. One end goes into the output hook ups on your amp red to red white to white and the other end goes into your CD player "if it has the ports on it" most aftermarket CD players will have the hook ups for it but if not you will need to go to the store and get an adapter for it. Last you have your ground wire that goes from your amp to the body of the car. Pull up the cover or mat in your trunk and see if there is a but or bolt you could in screw the insert your wire and pinch it back down but make certain it is a good connection. Sand the area if there is rust or paint until smooth bare metal. Then you just need to hook up you speakers to your amp and you should be ready to go! Hope this helps

Posted on Oct 21, 2015


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1 Answer

Crainemy la690 amp is mounted between 2 15" BOSS speakers in a custom built box. it is hooked up with 8 guage wire system and has a 30W fuse. it is overheating really bad and don't know why? do you...

You need to look at your wiring of the speakers and the Ohm rating on your speakers.
Below are the specs of the amp. You have the Tri-Way amp and the switch that controls
which way it configures it's output is critical. If you are powering just 2 speakers you set the
the Tri-Way to bridge only. Problem is, I cant find a manual. Legacy's site ( Manual Coming Soon.I say call them and ask for a manual to be emailed to you or mailed.

Legacy Car Audio Inc.
1600 63rd Street
Brooklyn N.Y. 11204
Phone (718) 535-1800
Toll Free 1-800-444-5671

You can also contact us by email For Support [email protected]

  • American Legacy II Series
  • 1000W High Performance 4 Channel Bridgeable Amplifier
  • Tri-Way Output Configuration:
    • 250W x 4 Channel Power Output
    • 500W x 2 Bridged Power Output
    • 250W x 2 Channel (Front) + 500W x 1 Channel (Rear)
  • 2 Ohm Stereo Stable
  • Mar 19, 2011 | Legacy Audio American Legacy II LA690 Car...

    1 Answer

    I need to know the size of external fuses for a american legacy amp 2000 watt 2 channel 1990

    25 to 30 amp fuses will work great, anything lower could possibly blow a fuse when a good bass note hits even if there is nothing wrong with the amp. Hope this helps.

    Jul 09, 2010 | Legacy - American II: 2 Channel 2000W...

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    I have an american legacy series 2 1000watt apm

    Check and see what size fuses it uses. Your watt power means nothing without good fuses. My suggestion would be to go buy 40a fuses and replace the ones you already have.

    Feb 27, 2009 | Legacy Audio American Legacy II LA290 Car...

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    Amp problem

    Have you checked the fuses on the amp?

    Have you confirmed that you have both B+ and remote voltage at the amp?'

    When measuring the voltage, place the black meter probe on the ground terminal of the amp.

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    Amp shutting off going into protection mode

    Check this out:

    Aug 14, 2006 | Legacy Audio American Legacy II LA690 Car...

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    American legacy II LA690 amp

    it's shutting off for a reason. What speakers are you trying to run? Do you know what impedance they are wired for? Where is the gain set? When bridged that amp is only stable at 4 ohms mono and will/should shut down at impedances lower than that.

    Mar 22, 2006 | Legacy Audio American Legacy II LA690 Car...

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