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Message: <blockquote data-quote="n2audio" data-source="post: 5300744" data-attributes="member: 540940">An efficient 1000w sub amp and an averaged size 4 ch isn't enough to say you definitely need to upgrade your charging system.  By "800w kenwood" I assume you mean 800w max, probably 70x4 or so if you're just running four 4 ohm speakers.There are a lot of cars that shouldn't have much trouble with a system that size.  It depends largely on what you drive, and how you listen.You have to realize your ~1300w system that can theoretically draw 130A or more will almost NEVER actually require that much playing music.  The real world average current demand of your amps will probably be in the 20A range.It's the low rpm, heavy bass, high volume listening sessions that will put your alt and batt to the test.  If you don't do that very often it might run fine.</blockquote>

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