WordNet (r) 3.0 (2006):

tweeter
    n 1: a loudspeaker that reproduces higher audio frequency
         sounds; "the sound system had both tweeters and woofers"

Moby Thesaurus II by Grady Ward, 1.0:

30 Moby Thesaurus words for "tweeter":
   acoustical network, capacitor speaker, coaxial speaker, cone,
   crossover network, diaphragm, dynamic speaker, earphone,
   electrodynamic speaker, electromagnetic speaker,
   electrostatic speaker, excited-field speaker,
   full-fidelity speaker, headphone, headset, high-fidelity speaker,
   high-frequency speaker, horn, loudspeaker, low-frequency speaker,
   midrange speaker, monorange speaker, moving-coil speaker,
   permanent magnet speaker, speaker, speaker system, speaker unit,
   triaxial speaker, voice coil, woofer



The Free On-line Dictionary of Computing (30 December 2018):

woofer
tweeter

    (University of Waterloo) Some varieties of wide paper
   for printers have a perforation 8.5 inches from the left
   margin that allows the 3.5 inch excess on the right-hand side
   to be torn off when the print format is 80 columns or less
   wide.  If done with sufficient aplomb this makes a sound like
   the "woof" of a dog.  If the large part is the "woofer" then
   the small part must obviously be the "tweeter", following the
   names for the large and small cones in a hi-fi loudspeaker.

   These terms have been in use at Waterloo since 1972, but are
   unknown elsewhere.

   Compare chad.

   [Jargon File]

   (1997-03-21)