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Message: <blockquote data-quote="bubbagumper6" data-source="post: 6923705" data-attributes="member: 567719">There is no straight formula, but it's usually linear.  ex. 1000w @ 2 ohm, 2000w @ 1 ohm, would then be something like 2250 @ 0.75 ohm.  This is just an estimate, unless the manufacturer specifically states what the amplifier will do at that impedance, you can not know for sure (without bench testing).Assuming that amp is 1500w, a stock alt with 1 batt is kind of wimpy, you'll have voltage dips, a second battery would be better.The gain does limit the output but not in the way you think.  100% gain does not mean 100% power.  You can use it to limit the amp like you want, but you need to do some more research on how the gain works.  I recommend this site:  <a href="http://www.bcae1.com" target="_blank">Basic Car Audio Electronics</a></blockquote>

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