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I think you might want to look into the amperage. That's the reason you can grab both car battery connections and nothing happens, then AFTER the coil, it'll shock you like nobody's business. If your computer DC 12V output thing has really high wattage, it might fry the amp. Also be careful what speakers to run, as in home and car audio speakers use different ohms (?ithink?). Call up an electrician or stereo installation shop, maybe they could help more!
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