If you compare the absolute values with those of the reference, the Phanteks T30 cuts quite a good figure. Despite significantly higher speeds, it is not hardly any louder, but achieves significantly more throughput. At lower speeds, the result evens out again in places. For this very purpose, we have added a very complex measurement in 5-cfm steps at the end, which puts the sound pressure level as a curve over the entire speed band in relation to the volume flow.
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.
Phanteks T30
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
Phanteks T30
Noctua NF-A12 PWM
Frequency spectrum in the housing
Next, let’s look at the frequency analyses of all measurements for the Phanteks T30 and all three 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:
3000 rpm
![](https://www.igorslab.de/wp-content/uploads/2021/08/o.R-500-RPM-980x560.jpg)
![](https://www.igorslab.de/wp-content/uploads/2021/08/o.R-1000-RPM-980x556.jpg)
![](https://www.igorslab.de/wp-content/uploads/2021/08/o.R-Max-RPM-980x555.jpg)
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