The total harmonic distortion (THD) is a measurement of the harmonic distortion present in a signal and is defined as the ratio of the sum of the powers of all harmonic components to the power of the fundamental frequency. Distortion factor, a closely related term, is sometimes used as a synonym. In audio systems, lower distortion means the components in a loudspeaker, amplifier or microphone or other equipment produce a more accurate reproduction of an audio recording.

Convert Distortion THD ( % ) to Damping Factor ( dB ) Distortion Factor THD (k)   %      Convert Damping Factor ( dB ) to Distortion THD ( % )  Distortion Attenuation a   dB

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