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<blockquote data-quote="helotaxi" data-source="post: 2995316" data-attributes="member: 550915">The amp doesn&#039;t &quot;know&quot; anything.&nbsp; The output of the amp is at a certain voltage.&nbsp; The current that the voltage induces in the load of the speakers is determined by Ohm&#039;s Law: V=IR where V is the output voltage, I is the current and R is the speaker impedance.When you measure the coil of a sub with a DMM, you are measuring the DC resistance of the coil which is less than the nominal impedance.&nbsp; Impedance is the resisitance plus the inductance product plus the back EMF from the coil moving in the magnetic gap.&nbsp; The resistance of the coil is determined by the length and gauge of the wire wrapped around the former in the coil.The final load that the speaker presents to the amp is determined by the wiring configuration, series, parallel or a combination of the two.<a href="http://www.bcae1.com" target="_blank">http://www.bcae1.com</a> is a site that will help you out a lot with the basics of the electrical aspect of the hobby.</blockquote>

[QUOTE="helotaxi, post: 2995316, member: 550915"] The amp doesn't "know" anything. The output of the amp is at a certain voltage. The current that the voltage induces in the load of the speakers is determined by Ohm's Law: V=IR where V is the output voltage, I is the current and R is the speaker impedance. When you measure the coil of a sub with a DMM, you are measuring the DC resistance of the coil which is less than the nominal impedance. Impedance is the resisitance plus the inductance product plus the back EMF from the coil moving in the magnetic gap. The resistance of the coil is determined by the length and gauge of the wire wrapped around the former in the coil. The final load that the speaker presents to the amp is determined by the wiring configuration, series, parallel or a combination of the two. [URL="http://www.bcae1.com"]http://www.bcae1.com[/URL] is a site that will help you out a lot with the basics of the electrical aspect of the hobby. [/QUOTE]

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