Frequency Plots
Min Fan Speed
25% Fan Speed
50% Fan Speed
70% Fan Speed
75% Fan Speed
100% Fan Speed
The dominant frequencies are from 400 to 800Hz. At full speed, the 5KHz noise is the second highest. The highest is above 16KHz, which doesn’t matter because most people cannot hear such high frequencies.
If you notice, I also performed frequency analysis at 70% because noise output was higher at this level than at 75%. I found out that at 70% speed, noise increases at 400Hz.
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
25% Fan Speed
50% Fan Speed
70% Fan Speed
75% Fan Speed
100% Fan Speed
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