Originally Posted by nervx
Higher Static pressure is ideal for heatsink/radiator fans right? For intake or exhaust case fans does it matter?
Tator in the OP you mention both silent wings having a low bearing hum. Is it noticeable in a case at all speeds?
Is the hum similar to the noise the corsair af140s make? Those fans are noisy because of that sound and I need to make sure the silent wings don't suffer from the same problem.
Part of the reason I stopped so early is I felt I wash pushing out those paragraphs too quickly and I wasn't getting my point across well enough. I needed to be direct, elaborate, & precise. Something I didn't see I was accomplishing.
The AF120 / AF140 fans, and to a certain degree the AP120's (though they mask it some with airflow noise) create a medium pitch bearing turn. This type of noise is indicative of a fluid bearing design that doesn't have a proper balance to the input side of the motor. What you're hearing with them is the physical motor noise from the fan.
The Silent Wing 2's that I have (mind you, they came in a small but well padded box all the way from BeQuiet's main HQ in Germany) have a slight bearing hum. It's the exact hum you would get on a fan that just doesn't have the coils wound tight enough. This is electrical noise that's so low in pitch, that at a distance of more than a 12 inches, you can't hear it at all. For that matter, I only heard it at 3v with my ear practically making love to the fan.
From a wave form analysis (thanks to the shotgun mic I was renting for a short period of time), I could actually see that it was there the whole time.
I don't think this is a matter of QC but instead a matter of the fans being shipped across the globe and beaten up the whole way here. As the shipping box was pretty mangled at my door step and it most likely took enough shocks to kill a man.
That sort of noise won't even effect the 0.1% of users, even if they were to experience it.
As for Static Pressure;
Heatsinks, Radiators, & drive cages. Those three things are the biggest choke points for a fan in a case. Drive Cages are actually the worst in most cases theses days. As you have low flow scenarios like the Define R4, P280, Deep Silence 1, Obsidian 550D, & Silencio 600 which choke up fans using a front door, air filter, & fan guard.
Then you have drive cages to blow through on top of that.
If you can, the best option for a Define R4 is to move the lower drive cage closer to the PSU and keep the front slatted fan guard off. Only leaving on the air filter. This should give you the best design for airflow on that case without leaving the door open to essentially make it a Arc Midi.