Author Topic: Estimate the nominal impedance.  (Read 521 times)

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Offline ampliwireTopic starter

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Estimate the nominal impedance.
« on: July 03, 2021, 07:51:07 pm »
Hello guys,
quite new here..
I did an impedance sweep over a bookshelf speaker, and was woundering what in this graph do you use to tell the nominal impedance?
The chart contains several different impedances, so I have never figured out what/how you tell the nominal impedance from this..
 

Offline bdunham7

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Re: Estimate the nominal impedance.
« Reply #1 on: July 03, 2021, 08:03:09 pm »
Nominal literally means 'as named', so it is whatever the manufacturer or whoever says it is.

With speakers, the typical amplifier isn't bothered by high impedance within reasonable bounds, but can be overloaded by low impedance.  Since speakers typically have these high and low impedance peaks, the nominal impedance is generally called a little higher than the low points, and then usually in powers of 2--2/4/8/16 ohms.  That's just a tradition and really only applies to normal hi-fi speakers, not PA or other types.  There's no reason you couldn't have a 6 ohm or 10 ohm nominal rated speaker.

I would call this one an 8 ohm speaker and I don't think too many would disagree.

A 3.5 digit 4.5 digit 5 digit 5.5 digit 6.5 digit 7.5 digit DMM is good enough for most people.
 
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