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Old 18th September 2010, 04:16 AM   #1
tuneman is offline tuneman  Australia
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Default do piezo compression drivers have an impedience

as the title says,

i've always wondered, they dont measure anything with a meter!
is there any way of testing them? besides the obvious they either work or don't
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Old 18th September 2010, 05:38 AM   #2
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Impedance bridge.
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Old 18th September 2010, 06:42 AM   #3
dangus is offline dangus  Canada
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Instead of an impedance bridge, set up a sound card to do impedance tests. Google will find information.

Anyway, piezo drivers are supposed to be mostly capacitive. That might explain why some amps don't like it if you connect a piezo tweeter without some series resistance.
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Old 18th September 2010, 11:10 PM   #4
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They are indeed almost entirely capacitive - so any ohmmeter that uses DC will show open circuit - such a meter only measures resistance, not impedance.
Only an LCR meter that measures with an AC test signal will give the true impedance - which to be strictly correct, is a complex number (i.e. involves the square root of a negative number).
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