If you compare the absolute values with those of the reference, the fan cuts quite a good figure. Despite significantly higher speeds, it is not hardly any louder, but achieves significantly more throughput. At lower speeds, the result evens out again in places. For this very purpose, we have added a very elaborate measurement in 5-cfm steps at the end, which puts the sound pressure level as a curve over the entire speed band in relation to the volume flow.
Sound comparison (recording) at 100% speed
As just mentioned, the subjective feeling is a slightly more distinct noise from the motor and the rotor blades, which is of course also due to the slightly higher speed. The reference fan produces slightly less motor noise, whereas the MSI fan others can be described as loud. On the contrary, because the acoustic impression at the measuring microphone is also somewhat deceptive here.
MSI MEG Silent Gale P12
Noctua NF-A12 PWM
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
The sound carpet is subjectively almost the same, you can really leave it like that
MSI MEG Silent Gale P12
Noctua NF-A12 PWM
Frequency spectrum in the housing
Next, let’s look at the frequency analyses of all measurements for the fan and all three speeds tested. The graphs speak for themselves, as you can also see a small lower frequency peak of the engine at full speed quite clearly:
![](https://www.igorslab.de/wp-content/uploads/2021/09/1000-RPM-980x560.jpg)
![](https://www.igorslab.de/wp-content/uploads/2021/09/500-RPM-980x556.jpg)
![](https://www.igorslab.de/wp-content/uploads/2021/09/MAX-RPM-980x558.jpg)
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