Several techniques are currently in use for measuring distortion of audio equipment. These include THD, IM-difference frequency, sine-square, random noise, and recently a three-tone intermodulation distortion test has been proposed. This paper compares the various methods, both theoretically and practically. The effects of changing the test frequencies used in each test on its sensitivity and practicality are discussed. It is found that this yields a significant improvement in sensitivity to many forms of distortion.
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