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Impedance change!?

Hi, 

I'm after some expert advice :)

I got hold of a pair of Celestion15s recently and they blew a channel on my Sharp SM1122 amp (it was my Dad's) which accepts 4-16 ohms. 

Impedance is a rock solid 5.2 ohms on one speaker, and a wavering 11 ohms on the other (so it's highly suspect!) The label says 4-8ohms. 

I've googled of course, but can find no reason for this difference and would appreciate any input on how I can resolve this issue. 

Kind regards, 

Paul 



gtfour1154

Showing 2 responses by erik_squires

erik_squires
16,687 posts
 

I was told the crossover doesn't affect impedance, but I'll look into that now thanks to your advice.


Hahahaha, well that is not correct.

https://speakermakersjourney.blogspot.com/2016/12/crossover-basics-impedance.html

Multimeters are super basic, and at the drivers can test for the coil not being open or shorted, both bad, but can't really tell you the impedance of the drivers in audio frequencies, just DC.

Best,

E
erik_squires
16,687 posts
 
Hi Paul,
I strongly encourage you to measure the impedance using something like DATS V2 or Room EQ Wizard with a jig.

Miller is correct in that a multimeter which measures impedance at DC is not a helpful tool, but they should measure the same. 

The DATS or REW tools however can tell us a great deal about what's wrong.  You may alwo find DIYaudio a better place for these conversations.  You can measure your speakers, post the results, etc.
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