This question is about theory facts of class A audio amplifier.
It is known that class A amplifier is usually biased so that an amplifier's quiescent point is in the middle of the amplifying device's load line. For class B amplifier is known that it is biased in such manner that quiescent point is sitting at the lowest point of load line (in cut-off region). In terms of practical terms, class A will be crossover distortion free, while there will be at least some crossover distortion seen in output signal of class B amplifier.
However, author G. Randy Slone had mentioned in a book named "High power audio amplifier construction manual" under section of distortion mechanisms that crossover distortion cannot be completely eliminated from class A amplifier.
I wonder, whether his statement is really true, since it doesn't seems logical that crossover distortion could be recognized or measured in any way in class A amplifier. It seems reasonable for class A amplifier to completely eliminate crossover distortion since amplifying devices are fully biased and are conduction 360° of overall input signal. Does his statement holds true from any point of view? Because to me it seems pretty unrealistic for class A to generate even negligible amount of crossover distortion.