Question about Legacy Audio LA1030 Car Audio Amplifier

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LA-1030 Protect Mode

Its the Legacy LA-1030 1000 Watt 4ch Amp and it has the option to bridge each 2 channels (so you end up with a 2 channel amp) and i have 1 4Ohm sub bridged across channels 1 and 2 and channels 3 and 4 are empty when it starts pushing the subs its not clipping or anything, but it goes on protect. whjat do I do to fix this because to get a new amp is about $350 which i dont have for car audio right now but i would really like to keep my system. and the thing i dont get is how it sounds fine and doesnt even clip, so why would it go on protect?

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  • Eric May 23, 2009

    I don't think thats it, because its fine when its real low, but when i go to turn it up on the amp to make it how its supposed to be it goes on protect. and channel 3 & 4 are turned all the way down but when i start turning up channel 1 & 2, it gets to a point where it sounds good and its not clipping or anything and it just goes up protect.

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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

Posted on May 23, 2009

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You can't bridge that amp onto a load lower than 4 ohms. So you can't bridge that amp onto two 4 ohm subs. To get the most power out of your subs is easy. Run one channel to one sub and the other channel to the other sub. 165 watts RMS is plenty for most subs.

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This will create a 4 ohm load on your amp.

Although if it's a two channel and you have two subs it's usually pointless to bridge them because if you use one channel per subwoofer its going to be the same as if both subs were bridged. example) 800 watts x 1 bridged power of your amplifie (4 ohms) is the same power as 400 watts x 2 at 2 ohms.

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