NZXT Havik 140: NZXT's First CPU Heatsink
Posted: Wed Jun 01, 2011 12:35 pm
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This is known as a beat tone http://en.wikipedia.org/wiki/Beat_%28acoustics%29When both are placed on the Havik 140, the noise signature acquires an odd pulsing type sound audible at 7V and above. ...the speeds of the two fan samples were very close, within 30~40 RPM of one another.
I think Lawrence is correct in calling the phenomena as intermodulation; beat frequencies are a specific instance of the more general concept.b_rubenstein wrote:This is known as a beat tone http://en.wikipedia.org/wiki/Beat_%28acoustics%29