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Old 7th March 2007, 06:23 PM   #1
diyAudio Member
Join Date: Feb 2007
Location: Montgomery
Default Is this normal?

I just a reading of 6.1 ohms on a dayton rs 150s-8. I thought that is was a 8 ohm speaker. I also took it out of the garage, could the cold have given me this off reading?
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Old 7th March 2007, 06:50 PM   #2
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Join Date: Feb 2004
Location: Queensland Australia
I'd have thought that your reading was perfectly normal. The figures quoted for speaker impedance are usually specified as "nominal". The measurement is made of a coil inside a magnetic field and the impedance will vary with fequency. An "8ohm" speaker is usually only exactly 8ohms at a 3 or 5 points depending on the frequency and the type of box it is in etc. . What you probably measured was the DC component which you would expect to be about 6ohms. I think its perfect. You might find a text book or website that discusses speaker impedance. You will find that will address your concerns with a better technical explanation.
"It was the Springtime of the year when aunt is calling to aunt like mastodons bellowing across primeval swamps." P.G. Wodehouse.
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Old 7th March 2007, 06:51 PM   #3
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Join Date: Jun 2004
Location: Indiana
Thats about right for an 8 ohm speaker. AC impedence is higher than the DC resistance.

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