20 Most Recent Legacy 600 WATT 2 Channel MOSFET LA470 Car Amp Car Audio Amplifier Questions & Answers

this is a basic procedeur just look for any short between pins of each component.

Legacy 600 WATT... | Answered on Aug 09, 2007

Is there a 20 or 30 amp fuse plugged in to the amp near where the 12 volt connection is?
Usually, if an amp blows a fuse: something caused it.
You must remove that cause, before you replace the fuse or it will just pop another one

Legacy Car Audio... | Answered on Mar 03, 2018

This Legacy LA 420 amplifier features 400 watts of power, two channels (bridgeable), a two-way crossover, Mosfet power, 2 ohms stable, and THD less than 0.04%. The amplifier measures 10" x 9.5" x 2.75".

Legacy Car Audio... | Answered on Aug 24, 2017

Unfortunately, the amp is only 2 ohm stable, so the best option is to connect each subs voice coils in parallel (2 ohms) and connect the subs in series (4 ohms).

Legacy Car Audio... | Answered on Sep 20, 2016

It is old, so cheap secondhand. I found one for 40 GBP.


There are a number of better Legacy amps on eBay.
Legacy Car Audio Amplifier

Legacy Car Audio... | Answered on Jan 17, 2016

No, but you do need to have the REM connection from the amp connected to the remote turn on line of your head unit.

Legacy Car Audio... | Answered on May 07, 2015

When woofers stop woofing it is because the voice coil is heavily damaged and stuck in the magnet air gaps or there is no amplifier power getting to the unit. Speaker connects need to be checked along with amp power to another known good speaker. If that unit also does not work then there is an amplifier issue that needs addressing.

Legacy Car Audio... | Answered on Mar 12, 2015

if it really uses 1200 watts, that would call for a 140 amp fuse, which is outrageous. for that power, if turly approachable, you would need a v8 engine, and midified alternator(s) arrays, and a capacitor.

Legacy Car Audio... | Answered on Jan 03, 2015

i guess you need to check the watts of your amp and sub, maybe it not match the power of both item.

Legacy Car Audio... | Answered on Jul 28, 2012

From the description your audio output transistors or ic's have a short causing a load problem activating the protection circuit. Turn volume right down, power off, remove speaker wires from the back, power on! if protection kicks on it is the audio outputs in the receiver, if not! check speaker wires for shorts, hook back one at a time until defective wire or speaker is located. The audio outputs will need to be addressed by a technician since there is complexity involved.

Legacy Car Audio... | Answered on Mar 03, 2012

Hello e_cody_e,

The settings you have will not break anything and may sound OK.

But they may not be optimum for getting the best bass from your system. The SubSonic setting filters out frequencies below the threshold of hearing allowing the amp to put more power into the frequencies that can be heard. So, it should be set to about the same frequency that your enclosure is tuned for or just a little lower. If your enclosure is tuned for 35Hz, then the subsonic should be close to maximum.

Similarily, the low pass sends all frequencies below the setting to the subs, (other than those blocked by the subsonic filter) and is commonly referred to as the "crossover" frequency. Typical crossover frequencies for subwoofers are 60Hz, 80Hz and 100Hz. For a ported enclosure, lower is probably better.

The phase shift should be set to the position that best synchronizes the bass with the music. Because of the additional wiring required for the subs, the signal to them is sometimes slightly delayed causing the bass to be "out-of-sync" with the rest of the music. The thump of the bass comes just a little sooner or later than expected. If the bass sounds out of phase, turn the phase shift on, otherwise leave it off.

The "gain" or level control allows you to match the amps input to your head units subwoofer output. The best setting is usually as high as possible without distortion. Set it by turning up the head unit volume to about 3/4 maximum and then advance the amp gain until your subs just begin to distort. Then back it off slightly.

These settings should allow your amp to put the most power into the frequencies that your subwoofers are designed for and hence produce the loudest and lowest bass.

Hope this helps.

Legacy Car Audio... | Answered on Oct 07, 2011

Hook it up one way and turn it up a bit, then hook it up the other. As long as you don't crank the volume this won't hurt it.

The louder of the two is probably correct.

The Sub should move Outward with each bass hit, if it is backwards it will "****" in with each bass hit.

Legacy Car Audio... | Answered on May 04, 2011

for a remote turn on you can use the acc off of the ing ( test 12volt when car is on befor crank goes to 0 during crank then comes back to 12 voltswhen car is running 12 volts also goes to 0 when ing is turned off and key is in off positon. 12 volts from the battery fused 12 inches from connection and ground. also are you using some sortof high level adapter for an audio signal( this would tap into left and right spks either front or rears and provde you with rcas for your amp

Legacy Car Audio... | Answered on Aug 22, 2010

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