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<blockquote data-quote="theMessenjah44" data-source="post: 6367367" data-attributes="member: 609351"><p>that's right, but with this formula, "if you know any two, you can find the third" but once that sub starts moving, your impedance (ohm load) changes, so you went from knowing voltage and resistance....to only knowing voltage.</p><p></p><p>best way to do this is to find voltage and amperage instead, get a clamp meter to measure the amperage leaving the amp, and use your dmm to find voltage</p><p></p><p>Voltage x amperage = power</p></blockquote><p></p>
[QUOTE="theMessenjah44, post: 6367367, member: 609351"] that's right, but with this formula, "if you know any two, you can find the third" but once that sub starts moving, your impedance (ohm load) changes, so you went from knowing voltage and resistance....to only knowing voltage. best way to do this is to find voltage and amperage instead, get a clamp meter to measure the amperage leaving the amp, and use your dmm to find voltage Voltage x amperage = power [/QUOTE]
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