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many thx for your reply!
.. understand your arguments around pressure of different fan types and airflow considerations, but the fan "pwm"-control on a 2-wire fan is something different.

agree with the reduced noise on 50% speed and will try that now after receiving the 5015. my stock fan type on the other hand besides simple and usual fan noise generates a strange rumbling (very hard to describe) depending on the x-carriage movement, which is really weird.