If you compare the absolute values with those of the reference, you will hear a bit more of the operating noise especially from thicker radiators. However, the fan performs quite well. Pressure creates counterpressure, also at the ears. Which brings us to a small peculiarity. During operation, we hear, among other things, an audible humming at about 1000 rpm, and not even a slightly lighter one at 800 rpm. You can live with that if you know it. It’s not extreme, but it’s noticeable, as the audio examples prove.
We have attached all fans that have already been tested with the more detailed method in the gallery for a better comparison
Sound comparison (recording) at all speeds
As just mentioned, the subjective sensation is a somewhat clearer noise from the motor and the rotor blades, which is of course also due to the different speeds. The fan produces significantly more motor noise, and the tearing noise at the rotor blade edges is also audible.
Case fan
25 mm radiator
45 mm radiator
60 mm radiator
If the speakers have survived the whole thing up to this point, we’ll now go into more detail.
Frequency spectrum in the housing
Let’s look at the frequency analyses of all measurements and all three tested speeds. The graphs speak for themselves, as there are hardly any disturbing peaks that lie outside the expected speed ranges for bearings and rotor blades.
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