noun
a device that converts electrical signals into sound, typically as part of a public address system
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The lecturer used a loudspeaker to ensure everyone could hear her presentation clearly.
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Can you turn up the volume on the loudspeaker? It's hard to hear.
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The DJ cranked up the loudspeaker and the party really got going.
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His voice boomed through the room like a loudspeaker, commanding everyone's attention.