Excerpt: Tweeter is the name of a speaker driver, an audio retail chain, and a Warner Brothers cartoon character. No, wait, that would be Tweety Bird. However whimsical the name may sound, the tweeter plays a crucial role in speaker design. An average one delivers not only high frequencies, as the chirpy name suggests, but also a significant share of the upper midrange. It's possible to design a loudspeaker without a tweeter.