Discussion
What does intermodulation distortion reveal that harmonic distortion may not?
Answer: B
Two tones through a non-linearity produce sum and difference products that can land well away from either tone, in parts of the band where the ear is sensitive and where no harmonic of either would appear. Clipping level, low-frequency response and noise are separate measurements. A test that generates products at frequencies unrelated to the input reveals non-linearity that a harmonic test can miss entirely, which is why both are specified. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.
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