Output Noise

We use a Class 1 Bruel & Kjaer 2250-L G4 sound analyzer equipped with a Type 4955a microphone that features a weighted dynamic range below 6 dBA and up to 110 dBA. All tests are conducted inside a hemi-anechoic chamber at 25–28 °C ambient, and the test subject is placed a meter away from the sound analyzer.



Noise is kept low because of the highly relaxed fan profile. The only problem is that there is no way to control the fan's speed through the operating system. With QNAP, Synology, and ASUSTOR NAS units, you can set a fan profile or control the fan's speed manually. QSM, on the other hand, does not provide any fan-speed-control options at all.

Output Noise Comparison Graphs

The following graphs show the output noise of the XN3002T and compare it to that of other units we have tested in the past.