microphone - An electronic device that people talk into or sing into to make their voice louder, amplifier - An electronic device to increase the volume of sound., loudspeaker - An electronic device that is attached to an amplifier in a sound system., muffle - To decrease the volume and make sounds less clear., ear defenders - Padded protection for your ears against very loud sounds, silencer - equipment that makes sounds quieter.,

UNIT 2.3 Changing the volume of sound

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