If you compare the absolute values with those of the reference, you can often hear a bit more of the operating noise, especially on radiators. However, the be quiet! Silent Wings 4 there also really good. Pressure creates counterpressure, also at the ears. Which brings us to a small special feature that I had already teased on the first page. When running on the 60 mm radiator, we hear a slight humming at around 1600 rpm, among other things, on the other radiators it’s consistent at 1000 rpm and then at around 2000 rpm it hits the 25 mm and 45 mm radiators, while the other modes remain inconspicuous. Of course, you also have to classify these smaller peaks correctly, because they are only located where other fans already emit consistently high noise, even at maximum.
If you take off the fan and fix it with a rubber band (key rings, trouser band rubber), these vibrations are no longer audible (although present), because the frame (stator) now hangs freely. However, the more you put it on the radiator, the more these vibrations come into play again, although the radiator itself was mounted so firmly that it should be eliminated as a resonator. Now, of course, one can discuss the individual measurement methods, but we will test relevant to practice, as in industry, where drives (such as motors), are always measured firmly anchored. Unfortunately, we don’t have a way to pick up the vibrations via sensor on the rotor like the industry does, but a microphone can also be a good indicator. For this, there are also our long-term recordings.
For the comparison with the be quiet! Silent Wings 4 Pro 120 mm please move the orange slider in the graphic to the left to the desired position
Sound comparison (recording) at all speeds
As just mentioned, the subjective sensation is a somewhat clearer noise from the motor and the rotor blades, which is of course also due to the different speeds. The fan produces considerably more motor noise, and the tearing noise at the rotor blade edges is also quite audible. But: everything has been amplified here in the recordings, of course, so that you can hear it. In practice, you have to listen like a lynx.
Case fan
25 mm radiator
45 mm radiator
60 mm radiator
If the speakers have survived the whole thing up to this point, we’ll now go into more detail.
Frequency spectrum in the housing
Let’s look at the frequency analyses of all measurements and all three tested speeds. The graphs speak for themselves, as there are hardly any disturbing peaks that lie outside the expected speed ranges for bearings and rotor blades. With the determined 20.5 dBA at around 400 rpm, we have reached the limit of our measurement technology, which is an extremely good value in itself. Chapeau!
![](https://www.igorslab.de/wp-content/uploads/2022/07/MIN-RPM-980x559.jpg)
At 1000 rpm we are still in the very good midfield, despite the vibrations. If you take 900 or 1100 rpm as a fixed value, the fan is significantly quieter,
![](https://www.igorslab.de/wp-content/uploads/2022/07/1000-RPM-980x557.jpg)
At the maximum possible 2400 rpm, you can really hear the devil cough, because it gets really loud. But whether you need such a thing at all is a matter of taste and belief.
![](https://www.igorslab.de/wp-content/uploads/2022/07/MAX-RPM-980x558.jpg)
38 Antworten
Kommentar
Lade neue Kommentare
Mitglied
1
Urgestein
Urgestein
Urgestein
Urgestein
Urgestein
Veteran
Urgestein
Urgestein
Veteran
Urgestein
Urgestein
Urgestein
Veteran
Urgestein
Veteran
Urgestein
Alle Kommentare lesen unter igor´sLAB Community →