Total Harmonic Distortion (THD): Total harmonic distortion is a measure of the how much a given audio device may distort a signal through the introduction of added harmonics or overtones. These figures are usually given as percentages. THD figures below approximately 1% are inaudible to most people. However, distortion is a cumulative phenomenon, so that if a receiver, equalizer, signal processor, crossover, and amplifier are all rated at 'no greater than 1%THD', together, they could produce 5%THD, which may well be noticeable in the perceived sound.

 

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