Methodology
We use a Class 1
Bruel & Kjaer 2250-L G4 sound analyzer equipped with a Type 4955a microphone that features a weighted dynamic range of 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.
Output Noise Comparison Graphs
The following graphs show the output noise of the TerraMaster D5 and compare it to other (NAS) units we have tested in the past.