So: now it gets even more exciting! We really measured it several times to make sure there was no mistake. We see that in our measurement setup with the 25 mm radiator, the push mode acts slightly louder than the pull variant – but both are still louder than the push-pull combination of two fans! Only from a 45 mm radiator onwards, push and pull operation are about equally loud and push-pull is a bit louder for the first time. So, as expected throughout, actually.
Sound comparison (recording) at 100% speed
The subjective sensation is also a very quiet, somewhat humming noise from the engine, where the tearing noise of the propellers can only be guessed at. The reference fan generates a somewhat higher frequency spectrum with more noise, which is dominated by tearing noises.
Push mode
Pull operation
Push-pull operation
Sound comparison (recording) at 1000 rpm
Subjectively, the soundstage is the same, just a bit thinner, so even quieter.
Push mode
Pull operation
Push-pull operation
- 1 - Einführung, Testmuster und technische Daten
- 2 - Testaufbau, Messkammer und Equipment
- 3 - Volumenstrom (Airflow)
- 4 - Statischer Druck
- 5 - Geräuschemission (Lautstärke)
- 6 - Frequenzspektren im Gehäuse - Push Betrieb
- 7 - Frequenzspektren im Gehäuse - Pull Betrieb
- 8 - Frequenzspektren im Gehäuse - Push-Pull Betrieb
- 9 - Zusammenfassung und Fazit
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