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<blockquote data-quote="bonesninja" data-source="post: 4785089" data-attributes="member: 557079">What you are measuring with your DMM is called the Re (or DCR, the terms are essentially interchangeable). The Re (DCR) is the &quot;Direct Current Resistance&quot; of the voice coil. The DCR is relatively static and is, simply put, the resistance of the coil at rest.The rated nominal impedance is a different beast. Impedance is the opposition to the flow of alternating current and will vary based on things such as the frequency of the signal the speaker is playing. The &quot;rated&quot; nominal impedance of a speaker is basically an average of what load the speaker will present to the amplifier over it&#039;s intended operating range. So while it may be &quot;rated&quot; for an nominal impedance of 2ohm, depending on frequency the actual load presented to the amplifier may be higher (or slightly lower) than 4ohm.....and at the speaker&#039;s resonant frequency (Fs) the load could be significantly higher than the rated nominal impedance......30ohm or more depending on the speaker. Impedance also increases as frequency increases due to factors such as inductance.Most 2ohm speakers will have a DCR in the range of 1.4 - 1.9ohms</blockquote>

[QUOTE="bonesninja, post: 4785089, member: 557079"] What you are measuring with your DMM is called the Re (or DCR, the terms are essentially interchangeable). The Re (DCR) is the "Direct Current Resistance" of the voice coil. The DCR is relatively static and is, simply put, the resistance of the coil at rest. The rated nominal impedance is a different beast. Impedance is the opposition to the flow of alternating current and will vary based on things such as the frequency of the signal the speaker is playing. The "rated" nominal impedance of a speaker is basically an average of what load the speaker will present to the amplifier over it's intended operating range. So while it may be "rated" for an nominal impedance of 2ohm, depending on frequency the actual load presented to the amplifier may be higher (or slightly lower) than 4ohm.....and at the speaker's resonant frequency (Fs) the load could be significantly higher than the rated nominal impedance......30ohm or more depending on the speaker. Impedance also increases as frequency increases due to factors such as inductance. Most 2ohm speakers will have a DCR in the range of 1.4 - 1.9ohms [/QUOTE]

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