The 140mm fan operates at two speeds, in some cases considerably quieter than its 120mm counterpart. By the way, the somewhat louder action on the 25 mm radiator at 1000 rpm is interesting here again. We already had similar effects when testing the push-pull setup. First, let’s look again at the absolute values in the bar graph.
Frequency spectra at different speeds
Next, let’s look at the frequency analyses of all measurements for all fans measured and all three speeds tested. The graphics and sound samples (at 1000 and 1200 rpm) speak for themselves.
500 rpm
For this low speed, we did without a special sound sample, because the fan is almost inaudible.
1000 rpm
1200 rpm (100%)
- 1 - Einführung, Testmuster und technische Daten
- 2 - Testaufbau, Messkammer und Equipment
- 3 - Anlaufspannung und Drehzahlen
- 4 - Volumenstrom (Airflow)
- 5 - Statischer Druck
- 6 - Geräuschemission Gehäuselüfter
- 7 - Geräuschemission auf 25 mm Radiator
- 8 - Geräuschemission auf 45 mm Radiator
- 9 - Geräuschemission auf 60 mm Radiator
- 10 - Zusammenfassung und Fazit
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