Frequency Plots
50% Fan Speed
75% Fan Speed
100% Fan Speed
There is a noise spike in the 250-350Hz region. For your reference, 250Hz is the fundamental frequency of female voices. Human hearing is most sensitive between the 2-4KHz range.
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.
50% Fan Speed
75% Fan Speed
100% Fan Speed
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Some fans like the Arctic P12 have overvoltage protection. A lot of other fans don’t though.
hello, thanks for sharing your insight and test on fans… I love this fan… the only issue I have is the ball bearing noise… my questions is: is the noise lower on PWN or DC mode? thanks in advance!!
PWM always, at low speeds. At high speeds it doesn’t make a difference.