Impedance of speakers.

P

photographer86

Junior Audioholic
Ratings
24
#1
If my JBL s26 bookshelf speakers say a nominal impedance of 8 ohms, but I use a multi meter to read the ohms at the terminals and they read 5.2ohms should I change my amp to 6 ohms instead of 8 ohms?
 
TLS Guy

TLS Guy

Audioholic Slumlord
Ratings
7,743 16 25
#2
If my JBL s26 bookshelf speakers say a nominal impedance of 8 ohms, but I use a multi meter to read the ohms at the terminals and they read 5.2ohms should I change my amp to 6 ohms instead of 8 ohms?
No. You measured the DC resistance Re. That is not the impedance Zn.
 
Swerd

Swerd

Audioholic Spartan
Ratings
5,170 11 6
#6
A speaker's impedance isn't one single number such as 8 ohms. It varies with the frequency of the sound. I couldn't find an impedance curve for your speakers, but below is one that's typical of a small 2-way speaker in a port vented cabinet. What matters most are the low points on the curve, the minimum impedance values. Around 200 Hz, this speaker has about 4 or 5 ohms impedance.
1562677415447.png
 
P

photographer86

Junior Audioholic
Ratings
24
#7
Lovinthhd thats for the great article, swerd thanks for the graphs. I follow. Was worrid for a minute cause of the dc impedance rating.
 

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