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Checking Speaker Impedance With a Multimeter
October 26, 2009

By pennalizer

Here is a video on how to read the impedance of a speaker. If you take a
reading of an 8 ohm speaker you will find that it does not read perfectly at 8
ohms. According to Anthony Lucas at Eminence Speakers “When a speaker is
labeled 8 ohms, it is actually a nominal reading. An ohm meter measures the
resistance to direct current (DC), but music is alternating current (AC). A
speaker’s impedance to AC depends on frequency and the nominal rated impedance
is sort of an average impedance over the useable frequency range of the
speaker”. So do not panic if you wire up a multi-speaker enclosure and it
reads below what you think it is going to read. Just observe proper polarity,
hook up your speakers and ROCK!!!

Click here to check out the Eminence Red Fang 10″
speaker.

Click here to check out the Eminence Red Fang 12″
speaker.

Click
here for more information about Eminence Speakers. Click on the icons for specs
and sound clips.

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http://www.intelligentcg.com Juan
Carlos

Hi Bill, I tested an 8 Ohm and a 4 Ohm speaker impedance with my multimeter
and the readings of both where 8.2 and 4.1, I´m not shure if this is correct
since you mantion that whe you read the impedance this way you get a lower
value.

Any comment would be appreciated.

Juan Carlos

http://pennalizer.com Billy Penn

Hi there Juan Carlos-

This is strange because any time I have ever read a speaker they always
read low. Not all exactly the same but low. Have you tried another meter? Try
another meter perhaps. What kind of speakers are they? And are they in 100%
working order? Let me know. -Billy

Scott Shannon

The meter measures resistance, not impedance. Impedance actually changes
based on the frequency of an AC signal. Speakers are given a rating based on
an average impedance over the range of frequencies it will be used. The meter
is a useful tool to give you an idea of impedance, but it won’t give you the
exact rating.

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