#electro-acoustic_transducer  a transducer that converts electrical to acoustic energy or vice versa
  supertype:  transducer  an electrical device that converts one form of energy into another
  part:  diaphragm
  subtype:  cartridge.electro-acoustic_transducer__pickup  an electro-acoustic transducer that is the part of the arm of a record player that holds the needle and that is removable
     subtype:  crystal_pickup__crystalpickup  a cartridge in which an output voltage is produced by the vibration of a piezoelectric crystal
  subtype:  earphone__earpiece__headphone__phone  electro-acoustic transducer for converting electric signals into sounds; it is held over or inserted into the ear; "it was not the typing but the earphones that she disliked"
     subtype:  telephone_receiver__telephonereceiver__receiver  earphone that converts electrical signals into sounds
        subtype:  headset  receiver consisting of a pair of headphones
  subtype:  loudspeaker_system__loudspeakersystem__loudspeaker__speaker__speaker_unit__speakerunit__speaker_system__speakersystem  electro-acoustic transducer that converts electrical signals into sounds loud enough to be heard at a distance
     subtype:  bullhorn__loud-hailer  a portable loudspeaker with built-in microphone and amplifier
     subtype:  squawk_box__squawker__intercom_speaker  the loudspeaker on an inter-com or public address system
     subtype:  tannoy  (British) a loudspeaker
     subtype:  tweeter  a loudspeaker that reproduces higher audio frequency sounds; "the sound system had both tweeters and woofers"
     subtype:  woofer  a loudspeaker that reproduces lower audio frequency sounds
  subtype:  microphone__mike  device for converting sound waves into electrical energy
     subtype:  bug.microphone  a small hidden microphone; for listening secretly
     subtype:  condenser_microphone__condensermicrophone__capacitor_microphone__capacitormicrophone  microphone consisting of a capacitor with one plate fixed and the other forming the diaphragm moved by sound waves
     subtype:  crystal_microphone__crystalmicrophone  a microphone in which sound waves vibrate a piezoelectric crystal that generates a varying voltage

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