I agree with Bill. Every instance of "fan noise" that I recall being
posted here ended up being assembly error (or more properly,
oversight). And since you say that they CAN be quieted down with
adjustment, I would suggestion checking for a wire touching the blades
when they spin. Loosening the nuts may be providing just enough
clearance so that the obstruction is no longer contacted. My
experience (with a pair of K3's) is that the fans should be entirely
whisper quiet.
Good luck!
de Doug KR2Q
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