APOLOGIES TO ALL: PIEZO TWEETERS DO SOUND LIKE ****!!!!
Capacitors, unfortunately, don't become low impedance at high frequencies; since they're made of rolled-up layers of foil and dielectric, they have an inductive component, and at high frequencies this becomes the most important; real-world capacitors show an impedance that falls with increasing frequency up to a point, then bottoms out, and rises as the frequency increases..
Peace,
Paul
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