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Message: <blockquote data-quote="94Mazda626" data-source="post: 6581330" data-attributes="member: 582332">This depends on the battery, and the music you're listening to as much as anything.  Remember that on most music you will not be pulling a steady 1500 watts, factor in any impedance rise you might get out of a box and you could be pulling much less than 1500 on average over a period of time.I have two amps with a combined rating of about 1000 watts rms in my setup on a 80A alt.  I get dimming but my voltage drops from 14.7 to about 13 on something really bass heavy.  If you're not dropping voltage below 12.5-13 I wouldn't worry too much about the dimming.</blockquote>

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