"It's not a bug, it's a feature."
It seems D4 pumps do that type of noise .
Quote:
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Originally Posted by Cathar
The noise would most likely be from the flipping magnetic fields of the brushless micro-controller introducing small vibrations. The Laing engineer said that a square-wave generator pattern is used to flip the fields, and indeed if you've ever listened to a square wave through a speaker, there is a striking similarity to the tone of the noise heard that the pump makes.
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