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powering a car amp & sub with computer psu


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i know it sounds retarded and incredibly unsafe but i'm not expecting to preserve anything and am bored out of my mind. Just had some parts laying around for a while and wanted tried this



anyways i tested the power supply first and it worked fine, did everything per instructions, plugged it in and nothing happened. Unplugged everything and power supply won't turn on anymore. Was a 375w psu trying to power a 250w amp, afaik the amperage was fine, but that doesn't change the fact that it's now dead. Not sure if the amp is OK but won't know till I get it powered up again. Is there any better but inexpensive way to do this ?

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