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Originally Posted by Roscal
Sound comes from the movement produced by the current shape in coils. In a D4, current is sent with a rectangular signal (simple electronic) whereas in the DDC the current is sinusoidal -> no more brutal transitions creating vibrations, it's a smoother rotation but electronics is more complex. Mechanical design in a DDC is the same of a D4, just a change of electronics (to simplify).
I put the DDC impeller in the D4 to test that fact but the noise is almost the same ->no impeller problem.
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Is it active voltage control by stepping the power transistors or just passive filtering with something like an LC filter?