Is this normal?

A_Reef_Scene · 7th March 2007, 06:23 PM

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?

Jonathan Bright · 7th March 2007, 06:50 PM

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.

mashaffer · 7th March 2007, 06:51 PM

Thats about right for an 8 ohm speaker. AC impedence is higher than the DC resistance.

mike

7th March 2007, 06:23 PM	#1
A_Reef_Scene diyAudio Member Join Date: Feb 2007 Location: Montgomery	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?

7th March 2007, 06:50 PM	#2
Jonathan Bright diyAudio Member Join Date: Feb 2004 Location: Queensland	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 Spring time of the year when aunt calls to aunt like mastodons across the frozen waste." P.G. Wodehouse.

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7th March 2007, 06:51 PM	#3
mashaffer diyAudio Member Join Date: Jun 2004 Location: Indiana	Thats about right for an 8 ohm speaker. AC impedence is higher than the DC resistance. mike

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