EX2 fan noise in 2020... bad for large HDDs?

I decided to change my old EX2 Ultra 2x3GB to brand new with 2x8GB. I`ve read 2-3 posts from 2018 and hoped stories about the noise were exaggerated… Unfortunately my new EX2 was so loud I returned it back after one day. It was not loud, it was extremely loud most of the time except idle time when not working. It must be a construction problem (fan) or/and bad firmware (doing system check made the fan slow down for few minutes). I went to look for competitive product (Sy….) and the quietness returned back despite I installed red pro HDDs, which are louder than standard red pre-installed. Be aware of this potential problem.