Frequency Plots
10% Fan Speed
25% Fan Speed
50% Fan Speed
75% Fan Speed
100% Fan Speed
At the 10% speed, don’t pay attention to the 50 Hz frequency. This was slightly increased because of a 1:1 transformer I had in operation outside the chamber. I just left that and didn’t take a new chart to show you how easy it is to have alterations in readings at such low noise output.
At 25-50% speeds, the dominant frequency is at 400Hz, while at 75% speed, it moves a bit lower, at 315Hz. At full speed, the loudest noise is within the 250Hz – 3.5KHz region.
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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