If you compare the absolute values with those of the reference, you can often hear a bit more of the operating noise, especially on radiators. However, the Lian Li Unifan SL-INF120 performs a bit better. So that fits as well.
Sound comparison (recording) at 100% speeds
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 different speeds. The Razer Kunai produces significantly more motor noise, and the tearing noise at the rotor blade edges is also audible.
Lian Li Unifan SL-INF120
Be Quiet! Light Wings 120 mm HS
Sound comparison (recording) at 1000 rpm
The sound is subjectively similar, which is and remains somehow louder and above all subjectively more intrusive. If you then also mount it on a radiator, it gets even more pressed and really nasty.
Lian Li Unifan SL-INF120
Be Quiet! Light Wings 120 mm HS
Total speed range (0 to 2100 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 have amplified the whole thing a bit so you can hear it better. So don’t set your listening level too high. The fan is not completely free of humming and this effect occurs every now and then.
If the speakers have survived the whole thing up to this point, we’ll now go into more detail.
Frequency spectrum in the housing
Let’s look at the frequency analyses of all measurements and all three tested speeds. The graphs speak for themselves, as you can see the engine’s lower-frequency peaks very clearly at all speeds. That sounds absolutely disgusting and we now know why. At 500 rpm, we also see the slight clacking of the bearing.
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