Midrange Speaker Test (500 Hz Warble Tone)

The 500 Hz warble tone is used in order to evaluate the midrange speaker response. This tone has different audio characteristics than a sine tone. This tone produces a warble sound. At the midrange frequencies, it is better to use a warble tone than a sine tone because the location of a warble tone source, such as a speaker, is easier to identify. A normal sine tone may set up a standing wave within a vehicle which makes it difficult to determine the source location.