What is your totally draw? Before you look into a new alternator you need to know how much power you are using, buying an upgrade that still isn't big enough won't do you any good.
http://www.qualitypowerauto.com/page...Calculator.php isn't perfect but gives a good general idea.
Further, did you install your system personally or have it done professionally?
If personally did you perform a "Big 3" upgrade? Did you put a capacitor in? What levels do you have your amps set at?
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