Posted by Wayne Parham [ 65.214.102.163 ] on March 21, 2007 at 10:51:49:
In Reply to: direct answer posted by MARLBORO on March 19, 2007 at 22:24:23:
Impedance from series wiring can be found easily with this formula:
Rt = R1 + R2 + R3 ...
Parallel wiring can be found with this formula:
Rt = 1 / ( 1/R1 + 1/R2 + 1/R3 ... )
Of course, this can only tell you the simple part of the impedance, and doesn't calculate the complex part. Impedance of a speaker is actually not a single value, but rather has peaks and dips. Actual impedance can be measured with a sine wave signal generator and an AC multimeter using a series resistor as a voltage divider. An easier way to do it is with a computerized measurement system like Speaker Workshop. That will measure impedance charts and much more.
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