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Audio Technology | How To's | Tips -

Harmonic Distortion and THD

Harmonic Distortion is the presence of odd-order harmonics that interfere with the natural even-order harmonics of the fundamental frequency.

Sounds develop harmonics in multiples of the fundamental frequency. Even-order harmonics sound warm and pleasant while odd-order harmonics are generally unpleasant to listen to. Odd-order harmonics are produced by clipping (the top or bottom of a waveform is abruptly cut off) and interfere with the 3rd and 5th harmonic of the fundamental. 

This measurement is taken at an SPL of 90dB with a microphone placed 1 meter from the speaker. The specification is presented as the ratio (%) of the sum of all the harmonic power present compared to the SPL of the fundamental frequency.

For example, the R5 produces <0.3% THD for the frequencies from 120Hz to 20kHz.  A THD below 1% is considered acceptable.

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