Discussion
An amplifier sounds gritty at low volume but clean when loud. Which fault fits?
Answer: C
Distortion that is relatively worse at small signals is the signature of crossover: the step at the handover is a large fraction of a small output and a negligible one of a large. Mismatched devices, supply sag and a bad connection would all worsen as the level rose. Whether a defect grows or shrinks with signal level is the most informative single observation about an output stage, and it points here unambiguously.
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