Discussion
Which imperfection does feedback reduce most usefully in a power amplifier?
Answer: A
Crossover distortion arises in the output stage, well inside the loop, so it is divided by one plus the loop gain and a modest output stage can be made to sound clean. Input noise and offset enter at the input and are amplified with the signal. The feedback resistors set the closed-loop gain, so their tolerance appears in the answer directly and is not reduced at all. Where an imperfection enters decides whether feedback helps with it, and that is the question to ask first.
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