Clifford Heath wrote:
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Piezo devices have all kinds of wacky high-Q resonances that push the
impedance all around the place. Overall capacitive, but you should stick
it on a VNA to learn the truth.


** Some early versions were pretty much a 100 or 220nF cap.

Speaker lead inductance, plus the usual series inductors built into linear amps, rendered them harmless.

In any case, Class D amps are perfectly OK with capacitive loads.

Despite what some NG Henny Penny is claiming ....


..... Phil