The term 'SPEAKER's Output' refers to the AUDIO that is produced by a SPEAKER. This AUDIO is created when a SPEAKER converts electrical signals into sound waves. The crossword solution for this term is AUDIO, which is an acronym for Aural Digital Input Output. AUDIO is used in many different applications, such as music, movies, and video games. It is also used in communication systems, such as telephones and radios. AUDIO is an important part of modern life and is essential for many activities.