Noise Blocker Black Silent Pro PK-3

Another fan sponsored by SeeingRed, thanks!!!

The noise blocker has near perfect sound quality at 4-5V. No rubbing, no motor ticks, just smooth sound. Unfortunately...like the yate loons, this fan starts having what I would describe as blade resonance with the radiator at higher speeds. You can barely notice it at around 7V and it gets progressively stronger on upwards. Noise level is about average down low and perhaps a bit higher than average at higher speeds. It does have very good RPM range and electrical efficiency is a fair amount better than the yate SM.

VIDEO LINK
http://www.youtube.com/watch?v=fLS7rUlWsGw