If you compare the absolute values with those of the reference, Lian Li Uni Fan SL120 RGB as a pure case fan a pretty good figure, but seems especially at 1000 rpm richly strained and becomes in the radiator mounting especially on the Slim Radiator then significantly louder than the reference. The fan hardly produces any tearing or bearing noises, but it does produce a rather growling and also audible motor noise. But we will only be able to tell from the frequency spectra and the audio samples, the numbers do not give any information about the actual sound character.
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.
Lian Li Uni Fan SL120 RGB at 1900 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 bit thinner, so even quieter.
Lian Li Uni Fan SL120 RGB at 1000 rpm
Noctua NF-A12 PWM at 1000 rpm
Frequency spectrum of the Lian Li Uni Fan SL120 RGB 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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