My qnap with 6x 12tb wd shucked (mix of types) sounds as expected ) not too noisy.I think this something to do with the AS5202T rather than the drives. I have one with two shucked WD Elements 18GB drives and they grumble for ages when powered up but the six 6TB Ironwolves in my AS6706T are barely noticable when they spin up or are in use.