Comparing the absolute values with those of the reference, the Alpenföhn Wing Boost 3 PWM 140mm doesn’t cut a good figure even as a pure case fan and only becomes a little less noisy when mounted on a radiator, when the throughput also drops rapidly due to lack of drive. Loud and useless, that’s really all I can think of.
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 can not be covered. The reference fan produces a somewhat higher frequency spectrum with more noise, but this is more bearable. The Alpenföhn Wing Boost 3 PWM 140mm, on the other hand, is as dominant as a driverless steamroller even in lower pitches.
Alpenföhn Wing Boost 3 PWM 140mm
Blacknoise B14x-P-BL ARGB
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 the same, to run away.
Alpenföhn Wing Boost 3 PWM 140mm
Blacknoise B14x-P-BL ARGB
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 see the lower frequency peak of the motor quite clearly:
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