Frequency Plots
Min Fan Speed
30% Fan Speed
50% Fan Speed
75% Fan Speed
100% Fan Speed
The dominant frequencies are 150Hz, 250Hz, and 630Hz. At full speed the noise increase at 250Hz is notable.
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.
Min Fan Speed
30% Fan Speed
50% Fan Speed
75% Fan Speed
100% Fan Speed
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