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Message: <blockquote data-quote="sharky" data-source="post: 8464991" data-attributes="member: 660401">There are 2 different methods of determining requirements of the alternator..one uses the efficiency of an amp (which is the more accurate method).My answer to the question is how ever much power you have, always leave as much headroom as possible with any system...Alternators work extremely hard when they work at or near their limits and wont live a very long life from the heat created...remember that your sound system isnt the only thing that uses power from the alternator.If you have a true 2000w RMS system you will want at minimum a 225 amp alternator to not have any problems down the road...This is based on a class D amplifier which has the highest efficiency..A class A/B would want even more.</blockquote>

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