Frequency Plots (M Mode – Low Speed)
10% Fan Speed
25% Fan Speed
50% Fan Speed
75% Fan Speed
Increased noise at 400 Hz here.
100% Fan Speed
The 500 Hz frequency is the noisiest at full speed.
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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