Is it the following?
Imagine a small toy boat in a bathtubs. Class A (electrons flowing all the time through the amplifier) means the waveform passes naturally from all values of displacement. The little ship moves by a hand, a water wave etc.
Is class D taking a hammer and hitting the little boat at periodic intervals? The boat does not move so abruptly as it has mass, inertia. This is mechanical low pass filtering.
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