Author Topic: tweeter  (Read 2217 times)

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Offline pete gTopic starter

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tweeter
« on: March 30, 2024, 08:40:39 pm »
hi all,i need clarification on tweeters. i see piezo tweeters listed as having 8 ohm impedance, do they have a voice coil? i thought they were made with crystals. what is the 8 ohms in reference to?  is it non-piezo tweeters that have 8 0hms resistance?
 

Online David_AVD

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Re: tweeter
« Reply #1 on: March 30, 2024, 08:44:04 pm »
Remember that (DC) resistance and (AC) impedance are not the same thing.
 

Online coppercone2

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Re: tweeter
« Reply #2 on: March 30, 2024, 10:25:25 pm »
use LCR meter
 

Offline SiliconWizard

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Re: tweeter
« Reply #3 on: March 30, 2024, 10:38:58 pm »
A piezo tweeter can be basically modeled with a capacitor in series with a resistor. The piezo element is essentially capacitive. The series resistor models the losses.
The impedance of any speaker can only be given as a graph vs. frequency (and even multiple curves, vs. power, but let's keep it simple).

Piezo tweeters typically have a pretty high impedance below their cut-off frequency. The range for which the impedance is more or less constant (it isn't) depends on the specific tweeter, but it's usually something between a few kHz to a few tens of kHz.

They absolutely do not have a voice coil, that's one of their plusses for high frequency response. Basically, it's a piezo element that moves a cone of some sort.

Something to read: https://pispeakers.com/PIE_Speaker_Application_Note.pdf
 


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