Output Noise

We use a Class 1 Bruel & Kjaer 2250-L G4 sound analyzer equipped with a Type 4955a microphone that features a dBA-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.



With both fans working in automatic speed mode, which is preferred, you will barely hear the NAS if it is placed inside an area with some form of climate control. In QTS, you can also set the speed of each fan individually.

Output Noise Comparison Graphs

The following graphs show the output noise of the TS-473 and compare it to that of other units we have tested in the past.