If you compare the absolute values with those of the reference, the Thermalright TL-B12 Extreme actually cuts quite a good figure. Despite significantly higher speeds, it is hardly louder, but achieves significantly more throughput. At lower speeds, the result evens out again in places. For this very purpose, we added a very elaborate 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. But acoustically, the devil is in the details here.
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 significantly higher speed.
Thermalright TL-B12 Extreme
Be Quiet! Light Wings 120 mm HS
Sound comparison (recording) at 1000 rpm
I ask you to pay attention to the clacking here, which is the cause of the scratch marks from page one:
Thermalright TL-B12 Extreme
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….
Frequency spectrum in the housing
Next, let’s look at the frequency analyses of all measurements of all three tested speeds. The graphs speak for themselves, as you can also see a small lower-frequency peak of the engine at full speed quite clearly:
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