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Message: <blockquote data-quote="Haunz" data-source="post: 5164524" data-attributes="member: 576010">Using subwoofers you have a reactive load that has inductive and capacitive components.. and what you are measuring is apparent power, and not real power.. so unless you know what the inductance and capacitance of the load is and can account for power factor, your numbers are basically meaningless.. (I suggest you wikipedia 'power factor' for a more indepth explination)Non inductive resistors have no inductance or capacitance and provide a dead load which makes it much easier to measure real power output... If you want to know more about how to set something that will work up PM me..FYI you should be using a 60hz tone if your DMM is not true RMS.. probably best for the accuracy of the craftsman clamp too.. (which are not very accurate to begin with)</blockquote>

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