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Blue: input. Green: Class-B output. Orange: Class-AB output. The Class-B amp has very high crossover distortion, while the class-AB has very low crossover distortion. So low, in fact, that it is invisible, but it is still there. A class-AB amp has both a A and a B in it not because it's a class-A amp driving a class-B amp, but because it always has at least one transistor on, similar to class-A, but most of the time only one transistor is on, similar to class-B. If you're skeptical, look it up. You can find this information by searching "learn about electronics", then going to it's front page, then going to the amplifier section, then going to subsection five (Power Amplifiers), then going to sub-subsection 5.3 (class-B) and sub-subsection 5.5 (class-AB). In the class-B sub-subsection, the bottom-most picture shows the crossover distortion.
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