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Message: <blockquote data-quote="creyc" data-source="post: 2435995" data-attributes="member: 570559">Speakers are rated by impedance, since they have a moving coil.  But to get a rough idea of the rating of a speaker without this information from the manufacturer, or the final impedance of multiple drivers if you don't know how to do the simple math, you can just measure the resistance that the amp sees with a multimeter.  It's not impedance however, it gives you the resistance, abbreviated "Re" in the thiel small properties.  Generally resistance will be a bit less than the impedance of the speaker, which is why 1ohm is mistakenly being called 0.7 in this thread.Resistance is a completely useful value, but because coils have an opposition to alternating current, and this opposition varies greatly throughout the frequency response, the impedance of a speaker is a complex number.</blockquote>

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