If you compare the absolute values of the NB-eLoop X B12-PS ARGB with those of the reference, it really cuts a fine figure! Due to the slightly lower speeds, it is even significantly quieter as a case fan than the Noctua fan. On the radiators, the picture then evens out again and both perform about the same, with an advantage for the reference fan, especially on the 45 radiator.
Sound comparison (recording) at 100% speed
The subjective sensation is also a very quiet, somewhat humming noise from the engine, where the tearing noise of the propellers can only be guessed at. The reference fan generates a somewhat higher frequency spectrum with more noise, which is dominated by tearing noises.
NB-eLoop X B12-PS ARGB at 1500 rpm
Noctua NF-A12 PWM at 1800 rpm
As a cautionary example of what’s really loud at around 1800rpm, I’d still have a cheap case fan from a PC table labelled on a rather high priced Taiwanese case supplier that could easily have been used to run octocopters through:
Sound comparison (recording) at 1000 rpm
Subjectively, the soundstage is the same, just a bit thinner, so even quieter.
NB-eLoop X B12-PS ARGB at 1000 rpm
Noctua NF-A12 PWM at 1000 rpm
Frequency spectrum in a case
Next, let’s look at the frequency analyses of all measurements for all fans measured and all three speeds tested. The graphics speak for themselves, as they also prove the slightly growly sound character:
![](https://www.igorslab.de/wp-content/uploads/2021/04/o.Radiator-500-RPM-980x553.jpg)
![](https://www.igorslab.de/wp-content/uploads/2021/04/o.Radiator-1000-RPM-980x558.jpg)
![](https://www.igorslab.de/wp-content/uploads/2021/04/o.Radiator-Max-RPM-980x555.jpg)
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