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Question about Legacy - American II: 4 Channel 1000W American II Series LA-690 Car Audio Amplifier

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Constant thumping when i turn the level up past 45% the sub starts thumping.even with the head unit off. i have a single kicker bridged on only 2 channels.my groung is fine.it didint do that untill my girlfriend unhoocked the sub and one of the leads touched the amp and blew the fuse

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Theres most likly an open ground printed circuit trace on the Printed circuit board on the bottom. first clue is You said your girlfriend disconncted and blew the fuse. You gonna have to ytake the amp apart and totally disassemble the PCB off the rails and everything unless theres a bottom cover. It may be an obvious burn or could be hidding under the green paint of a trace?? Goos luck

Posted on Jun 07, 2006

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