jakdedert wrote:
Not withstanding the below...you can get an 'idea' of the VC
impedance with an ohmeter...it will always be a few ohms below the
actual ac impedance. The frequencies involved are not so high as to
make a major difference; although the readings will not necessarily
be the same for two dissimilar 8 ohm speakers (around 6 ohms), or
speaker systems.

I would add that you can measure impedance precisely by driving the speaker
at a particular frequency, and measuring the ac voltage and current with
your VOM..

Which begs another question: will playing normal audio material through a
speaker, and measuring the ac voltage and current match the nominal
impedence reasonably well, say within 10%?

--

Mike Russell
http://www.curvemeister.com
http://www.zocalo.net/~mgr
http://geigy.2y.net


"waxhead" wrote in message
...
Further, the impedence will vary across the frequency range of the
speaker. The quoted impedence is a nominal impedence. An 8ohm
(nominal impedence) speaker can quite easily have a coil resistance
as low as
6.0ohm.

On Thu, 17 Jul 2003 19:13:42 +1000, Verdons wrote:

You are correct

"Denny B" wrote in message
...
Is it possible to measure Impedance with an ohm meter. For example
can you measure the Impedance of a 4 ohm car speaker with an ohm
meter?

When I tell people they cannot measure Impedance with an ohm
meter, you need an impedance meter and the impedance must be
measured with the speaker in operation, with a signal generator
supplying a fixed frequency, this always leads to disagreements
with the person who demands an ohm meter to measure what he calls
Impedance, when I tell him an ohm meter can only measure the
resistance of the coil there is always disagreement.

I tell them Impedance is AC resistance and what they measure with
an ohm meter is DC resistance. Disagreement here again.

Will somebody take me up on this and clarify the situation.

Thanks in advance
Denny B