Question about Legacy Audio LA470 Car Audio Amplifier

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Legacy LA470 red series2

One day the bass just quit and the protect lite came on and wont go off.The fuse is good, no burnt smell,just no sound...

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Re: Legacy LA470 red series2 - Legacy Audio LA470 Car Audio Amplifier Car Amplifiers

This can be caused by a blown subwoofer.

Posted on Mar 07, 2007

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My legacy la1495 amplifier will not come on,but there is power going to it

Is your remote turn on wire installed and the cables hooked up correctly? You can try jumping the 12vdc on the amp to the remote turn on lead to force it to turn on to see if it's a deck issue.

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1 Answer

Protect light is on ,no sound?

Make sure you have a good ground connection. The ground wire should be solidly connected to the vehicle chassis in a paint-free location. If the ground is connected badly, the protect light will come on.

Mar 08, 2011 | Legacy Audio Legacy - Red Series: 2...

1 Answer

My amp keeps going off on protection mode as soon as the bass starts bumping

check powers and earth, unplug sub and crank it up see if it still goes into protect if it doesnt the sub is too much load for that amp and could have damaged the amp, if it still does it then its a fault in the amp or power problem make sure you have good thickness 4gauge and good earth

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KAC9103d been running great for a year, factory refurb. for a month been losing sub output. checked all connections again, everything good. Turned on went driving 15 minutes later lost bass ckd again red...

Could be that you have a partially roasted(blown) coil on one of your subs which will function- but will keep tripping your amp.You can check that out just by using a different set of subs to listen to and by the process of elimination if the problem goes away then you know where the problem is at.Also check your gains you might be riding the gain a little high which causes distortion which causes heat(FAST) which will cause the amp to shut down completely or some amps will decrease output in a programmed attempt to save itself.turn the bass boost down to half if you even use it at all- that too can cause massive distortion in the amp itself,meaning only that if you have the bass boost on your deck turned up and then you turn the boost up on your amp the sound signal is then WAYYY distorted which will cause a thermal shutdown too. Last thing is to make sure that your subs arent running below 2 ohms because i believe that particular amp is designed to put out about 900 watts at 2 ohms.good luck

Jan 22, 2010 | Kenwood KAC-9103D Car Audio Amplifier

2 Answers

Amp is on, but sub wont produce any bass

Make sure the subwoofer is set to low frequency, make sure subwoofer and bass are enabled on the headdeck. Make sure the gain is turned up on the amp, make sure the rcas haven't come out of the back of the head deck.

Aug 04, 2009 | JBL GTO14001 Car Amp

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Protect LED on

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

Apr 11, 2007 | Legacy 600 WATT 2 Channel MOSFET LA470 Car...

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My amp quit working

ok I thought I anwered this one but first thing to try is disconnect all your speakers and see if the light goes out if it doesnt then your gonna need a schematic and a working know how on solid state amplifiers. first check al the outputs for the speakers for dc If theres dc on an output then that output device is shorted or leaky. Ive have open drivers as well as current control transistors leaky or shorted to that made the protection come on.. Good Luck

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