Tweeters are the component of an audio speaker system that reproduces high audio frequencies whereas the subwoofer reproduces low-pitched audio frequencies bass. A tweeter is small in size, usually less than two inches, and is often included in the speaker system to achieve crystal clear, top quality sound such as some vocals or higher-pitched instruments. It is recommended to wire up tweeters with crossover, which service as an audio frequency filter to ensure that tweeters receive the desired signals that they need for proper operation and sound quality.