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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  • Jimmy Driver 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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This can be caused by a blown subwoofer.

Posted on Mar 07, 2007

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HI. My Yamaha D80 while playing gave a burned smell and than sound quit. Rest works. I opened rearcover and notice 3rd fuse in the back was blown. Changed it. Blew again. So I stopped fidling around.


If the fuse blows and a smell of burning is present then its obvious there i a fault somewhere ahead of the fuse, the fuse is a protection device.

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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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Protect light is on ,no sound?


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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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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.

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It sounds like the bands inside the transmission are burnt. one way to check is pull you trans dipstick and smell the fluid and see if it smells burnt and the fluid should also be bright red. i have burnt a few trans myself and they did that.lol

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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.

Also how long ago was it flooded as it may take quite a while in a warm area to dry off completely ?

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