be quiet! Silent Wings 4 140mm High-Speed White Fan Review

Output Noise

I use a Class 1 Bruel & Kjaer 2270 G4 sound analyzer equipped with a Type 4955a microphone with a dBA-weighted dynamic range of below 6 dBA and up to 110 dBA. All tests are conducted inside a hemi-anechoic chamber with a noise floor close to 6 dBA and an ambient temperature of 25–28 °C. The test subject is placed a meter from the sound analyzer.

Full & 70% Speed

Fan_Noise_Full_Fan_Speed

Fan_Noise_70_Percent_Fan_Speed

Noise output is relatively low, especially at 70% of its maximum speed.

Speed (Percentage) – Noise

I use a different setup to drive the fan for noise measurements, so there might be a difference in the readings of the Longwin machine, especially in the max fan speed reading.

Fan_Speed_Noise

Fan_Percentage_Noise