If you compare the absolute values with those of the reference, the Fractal Prisma AL-12 PWM ARGB cuts a good figure. Not only is it usually a little quieter, but it also manages more throughput. For this very reason we 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 range in relation to the volume flow. And the Fractal Prisma AL-12 PWM ARGB can also score very well here.
Sound comparison (recording) at 100% speed
As just mentioned, the subjective feeling is a slightly more distinct noise from the motor and the rotor blades, which is of course also due to the different speeds. The Fractal Prisma AL-12 PWM ARGB produces a bit more motor noise, although already the reference fan others can be called loud.
Fractal Prism AL-12 PWM ARGB
Be Quiet! Light Wings 120 mm HS
Sound comparison (recording) at 1000 rpm
The sound carpet is subjectively almost the same, you can really leave it like that
Fractal Prism AL-12 PWM ARGB
Be Quiet! Light Wings 120 mm HS
Total speed range (550 to 2000 rpm)
Before I will explain the frequency analysis of the recorded spectrum to you, there is already the dreaded “station search”, where we will play through the fan operation from the lowest to the highest speed. And please don’t be alarmed, we’ve amplified the whole thing a bit so you can hear it better. So don’t set your listening level too high, though – it’s not particularly extreme this time. The Arctic P14 was a completely different calibre…
If the speakers have survived the whole thing up to this point, let’s now go into more detail.
Frequency spectrum in the housing
Let’s look at the frequency analyses of all measurements 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:
![](https://www.igorslab.de/wp-content/uploads/2021/12/500-RPM-1-980x558.jpg)
![](https://www.igorslab.de/wp-content/uploads/2021/12/1000-RPM-1-980x558.jpg)
![](https://www.igorslab.de/wp-content/uploads/2021/12/MAX-RPM-1-980x559.jpg)
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