Amplitude distortion is distortion occurring in a system, subsystem, or device when the output amplitude is not a linear function of the input amplitude under specified conditions.
It is not a distortion of the truth (excuse the shakespearian pun..!) to state that this effect has literally changed music history. The birth of rock music in fact owes a lot to this effect, which was discovered by chance as a result of a wrong amplification.
Wikipedia contents related with Amplitude distortion
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