RVK 4" vs RVK 6" noise levels

Hi there,

according to RVK specs, a 4" and a 6" put out very similar amounts of noise, around 46 dB both (at 3 meters). In spite of this, I've heard of some lads who got rid of their 6" and went for a 4" claiming the noise was just a whisper in comparison.

Is that maybe because in a 4" you can reduce the rpm to lower values without stalling the blades, so at lower settings a 4" is way quieter whereas at max rpm they're pretty much the same?

I'm a bit puzzled for this.. :confused:
 
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