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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
gtfour1154 OP
2 posts
 
Thank you very much for taking the time to reply (apart from Kenjit of course!), I really appreciate it :) 

I'll check wires and see what I can find, I'm aware the DMM doesn't give an accurate figure, but I just need ballpark at this stage of troubleshooting. 

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

Kind regards, 

Paul 


erik_squires
16,058 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
gtfour1154 OP
2 posts
 
Thanks for the link Erik, this was obviously the right place to go! 
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