If you compare the absolute values with those of the reference, the Silent Wings 3 does a pretty good job as a pure case fan, but it does get significantly louder than the reference when mounted on a radiator. The fan has its problems when it has to push the air onto a tight radiator. As a pure case fan, however, it is at least on reference level and is even almost inaudible at 500 rpm and below. Not even the Noctua can do that.
Sound comparison (recording) at 100% speed
As just mentioned, the subjective sensation is a rather dominant noise from the engine, through which the tearing noise of the propellers is covered. The reference fan generates a somewhat higher frequency spectrum with more noise, which is dominated by tearing noises.
be quiet! Silent Wings 3 at 1450 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.
be quiet! Silent Wings 3 at 1000 rpm
Noctua NF-A12 PWM at 1000 rpm
Frequency spectrum of the be quiet! Silent Wings 3 in the case
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 see the lower frequency peak of the engine quite clearly:
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