Frequency Plots
10% Fan Speed
There is a frequency spike at 50 Hz, but this is noise from the electricity network.
25% Fan Speed
The highest frequency, besides the 50 Hz one, which is noise from the electricity network, is at 800 Hz. Still, it is below 0 dBA
50% Fan Speed
The peak frequency is at 800 Hz.
75% Fan Speed
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The highest frequency is at 1 KHz, and I noticed a high spike at 315 Hz.
100% Fan Speed
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There is a high spike at 400 Hz, with the second loudest frequency at 800 Hz.
Signal Recordings
I have recorded the signals shown above, but please keep in mind that I’ve enabled Automatic Gain Control (AGC) to do so to make it easier for you to reproduce them. The provided recordings are only offered for aural identification purposes.
10% Fan Speed
25% Fan Speed
50% Fan Speed
75% Fan Speed
100% Fan Speed
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Why would the white version have a higher noise normalizing RPM than the black version with the same aerodynamic profile? That is, the white version is significantly quieter than the black version?