Comparing the absolute values with those of the reference, a complex picture emerges. As a case fan, it is always louder than the reference from about 800 rpm, but in return, it can score strongly on the different radiators when either full speed is applied, or this falls slightly below 1000 rpm. But since the performance is then usually better, the tendency is definitely in the direction of Rise Aurora 140 mm.
Sound comparison (recording) at 100% speed
As just mentioned, the subjective feeling is a slightly louder noise from the motor and bearing, while the impeller can act fine. It is also subjectively a little louder.
Alphacool Rise Aurora 140 mm
Blacknoise B14xP-BL PWM ARGB
As a cautionary example of what’s really loud at around 1800rpm, I’d still have a cheap case fan from a PC table labelled on a rather high priced Taiwanese case supplier that could easily have been used to run octocopters through:
Sound comparison (recording) at 1000 rpm
The sound is also very different here, even if the performance of the fan is not bad.
Alphacool Rise Aurora 140 mm
Blacknoise B14xP-BL PWM ARGB
Total speed range (500 to 2200 rpm)
Before I will explain the frequency analysis of the recorded spectrum to you, there is already the dreaded “station search”, where we will play through the fan operation from the lowest to the highest speed. And please don’t be alarmed, we’ve amplified the whole thing a bit so you can hear it better. So don’t set your listening level too high, though – it’s not particularly extreme this time. The Arctic P14 was a completely different caliber…
But even here, the progression isn’t quite as balanced as hoped and the fan has a certain humming every now and then, even if only so noticeable due to the amplification. However, we have already informed the manufacturer about this and I am sure that
If the speakers have survived the whole thing up to this point, let’s now go into more detail.
Frequency spectrum
Let’s look at the frequency analyses of all measurements and all three speeds tested. The graphs speak for themselves, as you can also see the lower frequency peak of engine and bearing noise very clearly with increasing RPMs:
500 rpm
1000 rpm
100% rpm
45 Antworten
Kommentar
Lade neue Kommentare
Veteran
Urgestein
Urgestein
Urgestein
Urgestein
Mitglied
Urgestein
1
Urgestein
Urgestein
Urgestein
Mitglied
Mitglied
Urgestein
Urgestein
Urgestein
Mitglied
Urgestein
Urgestein
Alle Kommentare lesen unter igor´sLAB Community →