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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...

Posted by Anonymous on

  • Anonymous Feb 27, 2007

    One day the sound just quit and the protect lite came on and wont go off.The fuse is good, no burnt smell,I took the top off and everything looks new,no burnt spots anywhere, just no sound. Please try and help thank you

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Brian Neathery

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  • 156 Answers

This can be caused by a blown subwoofer.

Posted on Mar 07, 2007

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I plugged up an Legacy LA470 300x2Ch amp. It stayed in protect mode and never changed to power mode. I checked the power and ground, works fine, then remote, works fine. I then checked the output to the...

I would suspect if the amp is known to be good, that someplace you have a shorted speaker wire... possibly someplace the insulation is cut through or maybe you have a bad connection with frayed strands shorting out the speaker. Use an ohmmeter to check the resistance between each set of speaker leads and then to ground.
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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
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would try it with the correctly rated fuse as there may not be enough wattage / current to power the bass unit with a thin wire.

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Do you have an ohmmeter to check to see if the sub's voice coils are still intact? Can you try driving the subs with another source to verify they are ok? We need to eliminate the variables here.

If the subs are okay then it's obvious that the problem is in the amp. I'm not sure if there are any protection devices internal to the amp, but I am sure if you remove the cover from the amp and if it was amp that was producing the burnt smell, you'll have no trouble visually identifying where the problem is in the amp. Most likely you'll find a part that is discolored or black & burned.

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- Jim


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