If you compare the absolute values with those of the reference, the Alphacool Rise Aurora 120 does not cut a bad figure at all. Despite significantly higher speeds, it is not that much louder, but achieves significantly more throughput. It doesn’t quite reach the low end of the reference fan even when geared, but it wouldn’t be any louder with the same throughput, as it can spin much lower to match the performance of the reference.
Sound comparison (recording) at 100% speed
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 significantly higher speed. The reference fan produces slightly less noise, although the Alphacool Rise Aurora 120 mm is also anything but loud.
Alphacool Rise Aurora 120 mm
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
Alphacool Rise Aurora 120 mm
Noctua NF-A12 PWM
Frequency spectrum in the housing
Next, let’s look at the frequency analyses of all measurements for all fans measured and all 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:
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