Question about Legacy - American II: 2 Channel 1200W American II Series LA790 Car Audio Amplifier

2 Answers

American II: 2 Channel 1200W American II

No power or protection light at all.i am very good with electronics,but i cant seem to find the trouble area on this amp.have checked resistors and heat syncs,which is the most common problems in car amps.and they test fine.any hints would be greatly appreciated.

Posted by john workman on

  • Kansas Dude Nov 19, 2007

    I have the same problem, the only problem is that i know nothing about electronics. I dont know what to do and I realy cant afford to buy a new one. What do I do?

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emanuel espi.oza

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Blue wire on deck usuelly need to be connected well .does the ground wire have a good connection no paint locking the frequency scrape it to metal.an drrect li.e to battery with fuse right befor the battery.are the wirers thick enough

Posted on Jul 21, 2014

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Check pwm ic 494 or other

Posted on Aug 09, 2007

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I have 2 amps instalkled in my car one is sony 1200w 2 channel amp for speakers and one is solid audio f2500d for 3 subs my sound and every thing was good but suddenly from yesterday im having trouble when...

First disconnect the CD head unit from the sub amp and see if the other amp works. If yes, the problem is the wires to the amp, the amp itself, or the subs/sub wiring. If no, the problem is the head unit--probably an internal short.
If the other amp works with the sub amp disconnected, reconnect the sub amp to the head unit, but disconnect the sub wires from the amp. Try the CD player. If the amp goes to protect with no speaker wires attached, the amp is bad. If the amp is OK, the problem is the subs or sub wires. Hook the wires up to the amp again, but disconnect them from the speakers. Try the player again. If the amp goes to protect, the problem is the amp wiring. If not, the problem is the subs. Check the impedance of each sub using an ohmmeter to determine which amp is out of spec.
Please let me know if you have questions, and thanks for using Fixya.
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I have a 1200watt amp that's only providing 300watt output with 8ohm Behringer B212 speakers. Is there a resolution and what would it be?

I'd need to know more about the amp, but don't forget, amps are rated as their max power...
So lets take a 300W/channel stereo amp at 8 ohms.
Ok, it's stereo, so there's 600W
But the amp is capable of 4 ohm loads...well, now you can deliver 600W/channel, for a total of 1200W
In this scenario, your amp is doing exactly what it was designed to do with those speakers.
If you wanted to get the full 1200W out of the amp, you'd have to hook up 2 more speakers in parallel to the ones already there. This drops the impedance to 4 ohms per channel = 600W / channel.
Yes, the power is split among the apeakers...300W per speaker into 4 speakers = 1200W
so any way you look at it, there's your 1200W
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I need to know the size of external fuses for a american legacy amp 2000 watt 2 channel 1990

25 to 30 amp fuses will work great, anything lower could possibly blow a fuse when a good bass note hits even if there is nothing wrong with the amp. Hope this helps.
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Is that on all the time or are you saying the light is on? If that light is always on that just means it's protecting your amp. If it's off and not playing bass then your in trouble
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Sony xplod 1200 watt

i had the same ploblem with my amp then i found out i didnt have a good enough ground. Make sure you groung it to your weel well or some part of the frame. Or you mite be running with a fuse thats pushing to much power i use a 100a fuse 5 gage power cord to power my 1200w xplode and my 2 12" kicker comps. Or if your using two diff kind of subs then you amp is confused in why your asking for 500w on one side and 600w on the other this will also make your amp light come on.
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Problem with legacy amp

I would check the RCA preamp wires connecting the stereo to the amp. If these are loose or broken, it could cause you to lose your sound.

Does the amp show signs of life, such as clicking on, an LED turns on, or anything like that?

Has anything else changed between the time it worked and didn't work?
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Installation

If you've got a standard 4 speaker system (2 front, 2 rear), your best option is to connect both left speakers to the left channel amp output and both right speakers to the right channel amp output. The only thing you lose is the ability to fade the speakers front to back.
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