Assertion: electrostatic speaker | /r/CapableOf | use work high voltages
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Source sentences:
text: Although they can produce excellent sound, they have a number of drawbacks: they generally don't work well at low frequencies unless they are very large (to compensate for having a thin diaphragm that doesn't move much); they need to use high voltages to work effectively, which means they need large transformers that consume a lot of power; and they're extremely expensive compared to traditional speakers.