Page "Nonlinear element" Paragraph 4
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Many circuit elements that operate linearly at low signal levels will show nonlinearity at higher signal levels.
At a high enough volume level, the transistors or other amplifying elements will begin to operate nonlinearly and distort the sound.
Conversely, nonlinear elements can be made to operate linearly if the signal in them is limited to a low level.
If the input of a non-linear device such as a transistor only varies in a small range around a fixed value, then the input / output relation is linearized around this fixed value ( usually called the quiescent point, Q-point, or Bias point ).
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