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Message: <blockquote data-quote="helotaxi" data-source="post: 3509883" data-attributes="member: 550915"><p>The coil has a set resistance, not impedance.  Impedance by its very definition is variable with frequency since it includes resistance to the change in current caused by inductance as well as capacitance.  Add a secondary fixed magnetic field that the coil is moving within and now you have back-EMF to deal with as well.  The coil acts like a generator with the current induced by the coil moving in the motor's field working opposite the current flow from the amp.  The amount that the cone moves determines the back EMF which is evidenced by the impedance being he highest at Fs in a free-air environment where the cone is moving the most.</p></blockquote><p></p>

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