Thermal compensation and thermal dynamics

Why quiescent conditions are critical

In earlier sections of this book we looked closely at the distortion produced by amplifier output stages, and it emerged that a well-designed Class-B amplifier with proper precautions taken against the easily-fixed sources of non-linearity, but using basically conventional circuitry, can produce startlingly low levels of THD. The distortion that actually is generated is mainly due to the difficulty of reducing high-order crossover non-linearities with a global negative-feedback factor that declines with frequency; for 8Ω loads this is the major source of distortion, and unfortunately crossover distortion is generally regarded as the most pernicious of non-linearities. ...

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