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Message: <blockquote data-quote="Databyter" data-source="post: 6819918" data-attributes="member: 621750">I'm dealing with a similar issue/question at the moment with a less powerful system, I'm going with a spare batt. (probably add it later because of my budget, this is a multi phase project).For me the choice came down to the fact that I like to kick it for long periods with the car turned off and the music blasting.With an isolator, as stated, only the Aux. battery to your amplifier is pushing current (and maybe a small amount to your head unit if it is wired to your starting battery).This way you can blast to your hearts content and then start up your car with no worries hours later.</blockquote>

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