Question about Legacy Audio LA1030 Car Audio Amplifier

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Amp no longer turning on

My Legacy LA1030 amp has stopped working. The power light nolonger comes on however there is a constant DC voltage on the speaker outputs even with no input signal. What do you think has blown?

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  • philmarsden Oct 05, 2008

    Yes the speakers do move ( cant remember which way) when the amp is powered up. I have also checked it with a volt meter think there was about 3v DC across the speaker outputs

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  • 631 Answers

Do the speakers push out or pull in when power is applied?

If not, how did you determine that is has DC on the speaker outputs?

Posted on Oct 05, 2008

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1 Answer

How much is a LA 1030 LEGACY amplifier?


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

http://retrorides.proboards.com/thread/54783/legacy-la1030-1000w-price-blackpool

There are a number of better Legacy amps on eBay.
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disconnect the speaker wires from the amp, and check for power. there is no resetting, other than simply turning the amp off and back on. if it powers up fine without the speaker/sub(s) connected, check your wiring and check the ohms with a meter. if you do not find a problem there(should read within 1ohm of how you wired it) then check for dc voltage coming out of the speaker terminals on the amp. should also check that the amp is getting good power and ground. if wiring and speaker(s) check out okay, then the amp is damaged. if you get dc voltage from the speaker terminals, the output transistors are shorted out and it needs to be repaired by a tech.

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1 Answer

Protect Mode


Your probably not pusing enough wattage to the amp. Look into buying a capacitor for your set up. and you may need to run a thicker guage wire to your amp.

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1 Answer

It does not turn on


Find and check the internal fuse....make sure you have a constant 12v+ (big red wire) when the ign. is OFF,and a switched 12v+, and a GOOD ground. It should make a clicking noise as it powers up.....if not, it's a boat anchor......sorry.

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LA-1030 Protect Mode


you have an unloaded channel,so the voltage is exceeding what the protect circuit is supposed to see.you have to connect an 8 ohm resistor across the output of the unused channel.
do not drive a signal into it or you will smoke the resistor.
a 10 watt will do ok with zero signal input

May 23, 2009 | Legacy Audio LA1030 Car Audio Amplifier

1 Answer

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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Distorted Bass


Check the specs on the required ohms for the speakers. If it calls for 8 ohms and your speaker is 4, then you are pulling twice the normal current and this has blown an output transistor.

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1 Answer

Protection Mode? amp wont start


With your multimeter set to DC volts and the black meter lead on the ground terminal of the amp, touch the red lead alternately to the B+ and remote terminals as the amp shuts down. If the voltage drops below ~11 volts, you need to check the wiring feeding whichever line is dropping too low.


If the voltage remains near or above 12v, disconnect all speaker wires and signal cables from the amp. If it powers up, the wiring needs to be checked. If it still shuts down, the amp likely has blown output transistors.

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1 Answer

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Hello jasper100, Have you opened the unit to take a look inside? Since you dont have a blown fuse we cans assue the a short has not occured. Now I would chect to see if the voltage regulator in the amp has voltage coming from it. It may not in that case you may have to remover the old regulator and put in a new one just to get to the point of properly troubleshooting this amp. I would suggest that you get a schematic for this unit and use a multimeter to look at the voltages in the power supply section and see which sections have no rail voltage (12v supply voltage). I would also advise checking the remote to for regulator failure.

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