Output Noise

For these measurements, we used a high quality CEM-8852 Sound DB Meter we installed 50 cm away from the NAS. Ambient noise in our lab was below 30 dBA while these noise measurements were taken.



Under normal conditions, the NAS is pretty quiet, producing around 33 dBA.


We extracted the files that control the fan's RPM by matching fan speed up with the temperatures of all installed HDDs. The above screenshots show the "/usr/syno/etc/scemd.xml" file which controls fan speed, adjusting it based on HDD temperature, and the "disk_temperature.xml" file. The latter lists the maximum operating temperatures for various HDDs, including several SSDs.

Output Noise Comparison Graphs

The following graphs show the DS414slim's output noise, comparing it to other units we have tested in the past.