Comparing the absolute values with those of the reference, the Razer Kunai Chroma does not cut a good figure. At full speeds it is a tad louder and on the radiator it is even much louder than the reference, even if we can’t even measure any airflow on the Razer Kunai Chroma then! Even the Arctic P12, which is a 5-Euro bargain, can do a much better job. And it was precisely for this purpose that 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. This does not include the radiator measurements, but it will be interesting even so.
Sound comparison (recording) at 100% speeds
As just mentioned, the subjective feeling 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.
Razer Kunai Chroma
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.
Razer Kunai Chroma
Be Quiet! Light Wings 120 mm HS
Total speed range (500 to 1500 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 free of humming and this effect also affects several speed ranges. Not even the cheap Arctic P14 was that bad.
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, because 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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