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<blockquote data-quote="n8skow" data-source="post: 7575094" data-attributes="member: 610656">I can foresee a little discrepancy in calculating the AC output side of the amp from the DC input... but the formula you&#039;ve listed is just another way to arrive at the &#039;calculated&#039; number - (depending on what measurements you have available)... and there are many useable formulas in Ohm&#039;s law.<a href="http://www.the12volt.com/ohm/ohmslawcalculators.asp#13" target="_blank">Ohm&#039;s Law Calculators</a>Without having hard data (voltage and amperage outputs from the amp) we can&#039;t use your formula in this instance (till someone can provide some actual numbers)... but it&#039;s also flawed to a degree in that it assumes a static impedance, whereas the impedance across a subwoofer is going to be reactive and change as the coil(s) heat and cool.Either of these formulas will get us in the same ballpark.//content.invisioncic.com/y282845/emoticons/cool.gif.3bcaf8f141236c00f8044d07150e34f7.gif</blockquote>

[QUOTE="n8skow, post: 7575094, member: 610656"] I can foresee a little discrepancy in calculating the AC output side of the amp from the DC input... but the formula you've listed is just another way to arrive at the 'calculated' number - (depending on what measurements you have available)... and there are many useable formulas in Ohm's law. [URL="http://www.the12volt.com/ohm/ohmslawcalculators.asp#13"]Ohm's Law Calculators[/URL] Without having hard data (voltage and amperage outputs from the amp) we can't use your formula in this instance (till someone can provide some actual numbers)... but it's also flawed to a degree in that it assumes a static impedance, whereas the impedance across a subwoofer is going to be reactive and change as the coil(s) heat and cool. Either of these formulas will get us in the same ballpark. [IMG]//content.invisioncic.com/y282845/emoticons/cool.gif.3bcaf8f141236c00f8044d07150e34f7.gif[/IMG] [/QUOTE]

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