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THD =Total Harmonic Distortion
Basically the amplifier outputs an amplified version of the input signal, right? Right. But, it also adds any distortion created by the amplifier. All amplifiers and signal processors add distortion to the signal, so this is a way to rate the distortion. Now can we hear the differences? There are many factors that contribute to this and you can make yourself nuts trying to figure it all out. But do a search on the web for "Total Harmonic Distortion" and you will see what I mean.
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