How can you determine a speaker's impedance(in ohms)?
06-13-03, 02:11 AM
#1
DVD Talk Godfather
Thread Starter
How can you determine a speaker's impedance(in ohms)?
I was given some speakers and would like to determine how many ohms they are so I can get the proper amplifier for them. They were home made (they have no spec labels or info) and I have no way of communicating with the previous owner. How can I test them (without an amplifier) to find out this information. Can I do it with a multi-tester / multi-meter?
Any help would be appreciated, Thank you.
Any help would be appreciated, Thank you.
06-13-03, 06:34 PM
#2
No, there is no simple way for you to determine. The speaker manufacturer would normally measure it as a function of frequency. It varies tremendously with frequency. The "nominal impedance" he specifies, usually 4 or 8 ohms is the closest standard impedance to the minimum impedance he sees over the frequency range and it usually occurs near the lowest frequency the speaker handles well, with higher impedance elsewhere. The dc impedance of the voice coil (what you measure with ohmmeter has basically nothing to do with it. I wouldn't worry. Get a speaker that drives 4 ohms well and you'll almost certainly be ok.
If bfrank appears, he could give a better technical definition.
If bfrank appears, he could give a better technical definition.
