If you compare the absolute values with those of the reference, the Arctic P12 PWM PST A-RGB 0dB does a really good job and is even quieter in all speed ranges! Also, the subjective sensation is a quiet, not growly noise, where the demolition noise dominates. This is surprising because the Arctic P12 PWM PST A-RGB 0dB has only a rigid frame without any decoupling. Due to the slightly lower speeds, it is even quieter as a case fan than the Noctua fan, chapeau! On the radiators the picture evens out again and both perform about the same.
Sound comparison (recording) at 100% speed
Also the subjective sensation is a very quiet noise from the engine, with the propeller tear-off noise slightly above that, but never really disturbing. The reference fan generates a somewhat higher frequency spectrum with more noise, which is dominated by tearing noises.
Arctic P12 PWM PST A-RGB 0dB at 2000 rpm
Noctua NF-A12 PWM at 2000 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 little thinner, so even quieter.
Arctic P12 PWM PST A-RGB 0dB at 1000 rpm
Noctua NF-A12 PWM at 1000 rpm
Frequency spectrum of the Arctic P12 PWM in the 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:
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